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All questions of Materials : Metals & Non-metals for Class 8 Exam
A metal which exists in liquid state:- a)Gallium
- b)Mercury
- c)Sodium
- d)Potassium
Correct answer is option 'B'. Can you explain this answer?
A metal which exists in liquid state:
a)
Gallium
b)
Mercury
c)
Sodium
d)
Potassium
|
|
Shivansh Jaiswal answered |
Answer:(B) Mercury
As it is liquid on room temperature
As it is liquid on room temperature
The most abundant element in the universe is- a)Oxygen
- b)Hydrogen
- c)Silicon
- d)Helium
Correct answer is option 'B'. Can you explain this answer?
The most abundant element in the universe is
a)
Oxygen
b)
Hydrogen
c)
Silicon
d)
Helium
|
Kaavya Saha answered |
Explanation:
The most abundant element in the universe is hydrogen. This is because hydrogen is the simplest and lightest element with only one proton and one electron.
Reasons why hydrogen is the most abundant element in the universe:
1. Formation during the Big Bang: During the Big Bang, which is believed to be the beginning of the universe, hydrogen was the first element to be formed. This is because the conditions were favorable for the formation of hydrogen nuclei (protons) and electrons.
2. Fusion in stars: Hydrogen is the primary fuel for stars. Nuclear fusion reactions in the cores of stars fuse hydrogen atoms together to form helium, releasing a tremendous amount of energy.
3. Abundance in interstellar gas: Hydrogen gas is found in abundance in interstellar space, the vast regions of space between stars. This gas can then gravitationally collapse to form new stars and planets.
Comparison with other elements:
Oxygen is the third most abundant element in the universe, after hydrogen and helium. It is formed in stars through nuclear fusion reactions, but it is not as abundant as hydrogen because it requires more energy to form.
Silicon is the seventh most abundant element in the universe. It is also formed in stars through nuclear fusion reactions, but it is not as abundant as hydrogen because it requires even more energy to form.
Helium is the second most abundant element in the universe, after hydrogen. It is formed through nuclear fusion in stars, but it is not as abundant as hydrogen because it is heavier and requires more energy to form.
Conclusion:
In conclusion, hydrogen is the most abundant element in the universe because it was formed during the Big Bang, is the primary fuel for stars, and is found in abundance in interstellar space.
The most abundant element in the universe is hydrogen. This is because hydrogen is the simplest and lightest element with only one proton and one electron.
Reasons why hydrogen is the most abundant element in the universe:
1. Formation during the Big Bang: During the Big Bang, which is believed to be the beginning of the universe, hydrogen was the first element to be formed. This is because the conditions were favorable for the formation of hydrogen nuclei (protons) and electrons.
2. Fusion in stars: Hydrogen is the primary fuel for stars. Nuclear fusion reactions in the cores of stars fuse hydrogen atoms together to form helium, releasing a tremendous amount of energy.
3. Abundance in interstellar gas: Hydrogen gas is found in abundance in interstellar space, the vast regions of space between stars. This gas can then gravitationally collapse to form new stars and planets.
Comparison with other elements:
Oxygen is the third most abundant element in the universe, after hydrogen and helium. It is formed in stars through nuclear fusion reactions, but it is not as abundant as hydrogen because it requires more energy to form.
Silicon is the seventh most abundant element in the universe. It is also formed in stars through nuclear fusion reactions, but it is not as abundant as hydrogen because it requires even more energy to form.
Helium is the second most abundant element in the universe, after hydrogen. It is formed through nuclear fusion in stars, but it is not as abundant as hydrogen because it is heavier and requires more energy to form.
Conclusion:
In conclusion, hydrogen is the most abundant element in the universe because it was formed during the Big Bang, is the primary fuel for stars, and is found in abundance in interstellar space.
Which of the following property regarding metal is correct? - a)Low melting and boiling point
- b)High melting and boiling point
- c)Low melting and high boiling point
- d)High melting and low boiling point
Correct answer is option 'A'. Can you explain this answer?
Which of the following property regarding metal is correct?
a)
Low melting and boiling point
b)
High melting and boiling point
c)
Low melting and high boiling point
d)
High melting and low boiling point
|
Jaideep Nair answered |
Properties of Metals: High Melting and Boiling Point
Metals are a group of elements that are known for their unique physical and chemical properties. One of the most important properties of metals is their high melting and boiling point. This property is due to the strong metallic bonding that exists between the atoms in a metal.
Metallic Bonding
Metallic bonding is a type of chemical bonding that occurs between metal atoms. In metallic bonding, the valence electrons are delocalized, meaning that they are not associated with any particular atom but are free to move throughout the metal lattice. This creates a sea of electrons that holds the metal atoms together.
High Melting and Boiling Point
The strong metallic bonding in metals results in a high melting and boiling point. When a metal is heated, the energy is absorbed by the metal lattice, causing the atoms to vibrate more rapidly. At a certain temperature, the energy is sufficient to overcome the metallic bonding, and the metal melts. Similarly, when a metal is heated to its boiling point, the energy is sufficient to overcome the metallic bonding and the metal vaporizes.
Examples
Some examples of metals and their melting and boiling points are:
- Iron (Fe): Melting point - 1535°C, Boiling point - 2750°C
- Copper (Cu): Melting point - 1083°C, Boiling point - 2567°C
- Gold (Au): Melting point - 1064°C, Boiling point - 2856°C
Conclusion
In summary, metals have a high melting and boiling point due to the strong metallic bonding that exists between the atoms in a metal. This property is important for many applications of metals, including their use in high-temperature environments such as furnaces and engines.
Metals are a group of elements that are known for their unique physical and chemical properties. One of the most important properties of metals is their high melting and boiling point. This property is due to the strong metallic bonding that exists between the atoms in a metal.
Metallic Bonding
Metallic bonding is a type of chemical bonding that occurs between metal atoms. In metallic bonding, the valence electrons are delocalized, meaning that they are not associated with any particular atom but are free to move throughout the metal lattice. This creates a sea of electrons that holds the metal atoms together.
High Melting and Boiling Point
The strong metallic bonding in metals results in a high melting and boiling point. When a metal is heated, the energy is absorbed by the metal lattice, causing the atoms to vibrate more rapidly. At a certain temperature, the energy is sufficient to overcome the metallic bonding, and the metal melts. Similarly, when a metal is heated to its boiling point, the energy is sufficient to overcome the metallic bonding and the metal vaporizes.
Examples
Some examples of metals and their melting and boiling points are:
- Iron (Fe): Melting point - 1535°C, Boiling point - 2750°C
- Copper (Cu): Melting point - 1083°C, Boiling point - 2567°C
- Gold (Au): Melting point - 1064°C, Boiling point - 2856°C
Conclusion
In summary, metals have a high melting and boiling point due to the strong metallic bonding that exists between the atoms in a metal. This property is important for many applications of metals, including their use in high-temperature environments such as furnaces and engines.
Basic solution turns:- a)Red litmus blue
- b)Red litmus green
- c)Blue litmus red
- d)No reacting
Correct answer is option 'A'. Can you explain this answer?
Basic solution turns:
a)
Red litmus blue
b)
Red litmus green
c)
Blue litmus red
d)
No reacting
|
C K Academy answered |
Basic Solution for Acid-Base Reactions:
In summary, the basic solution turns red litmus blue, red litmus green, and blue litmus red. If no reaction occurs, it indicates that the solution is neutral.
A: Red litmus turns blue
- An acid turns blue litmus paper red. This indicates that the substance is acidic.
- Red litmus paper is red when it is neutral or basic. If it turns blue, it indicates the presence of an acid.
B: Red litmus turns green
- In the presence of a base, red litmus paper can turn green. This is a result of the alkaline nature of the substance.
- Green litmus paper is green when it is neutral or acidic. If it turns green, it indicates the presence of a base.
C: Blue litmus turns red
- A base turns blue litmus paper red. This indicates that the substance is basic.
- Blue litmus paper is blue when it is neutral or acidic. If it turns red, it indicates the presence of a base.
D: No reacting
- If no change is observed in the litmus paper, it implies that the substance is neutral.
- Neutral substances do not have any effect on litmus paper, causing no change in the color of the paper.
In summary, the basic solution turns red litmus blue, red litmus green, and blue litmus red. If no reaction occurs, it indicates that the solution is neutral.
A metal which is a poor conductor of heat:
- a)Zinc
- b)Lead
- c)Iron
- d)Gold
Correct answer is option 'B'. Can you explain this answer?
A metal which is a poor conductor of heat:
a)
Zinc
b)
Lead
c)
Iron
d)
Gold
|
Ananya Das answered |
Lead has less metallic character, so it is a poor conductor of heat. Lead lies in group 14 of the modern periodic table. metallic characters decrease, as we move left to right in the periodic table. Metals are usually the best conductors of thermal energy. This is due to the way that metals are chemically bonded: metallic bonds (as opposed to covalent or ionic bonds) have free-moving electrons which are able to transfer thermal energy rapidly through the metal. Lead lacks this kind of electrons so it's a poor conductor of heat. But compared to non-metal it's conductivity is quite higher.
A substance composed of two or more metals is called:- a)Metalloids
- b)Non-metals
- c)Alloys
- d)all of these
Correct answer is option 'C'. Can you explain this answer?
A substance composed of two or more metals is called:
a)
Metalloids
b)
Non-metals
c)
Alloys
d)
all of these
|
Bhoopendra Sinsinwar answered |
Alloys means a substance formed from the combination of two or more metals. Alloys can also be formed from the combination of metals and other elements. Alloys has some properties of both metals and non-metals. For example Red gold , which is produced by alloying copper and gold together. Another example of alloy is Steel , which is produced by alloying iron (metal) and carbon (non-metal) together.
Which one of the following is a non metal?- a)Copper
- b)Chlorine
- c)Hydrogen
- d)Both (b) and (c)
Correct answer is option 'D'. Can you explain this answer?
Which one of the following is a non metal?
a)
Copper
b)
Chlorine
c)
Hydrogen
d)
Both (b) and (c)
|
|
Parvez Attar answered |
Yes. The answer is B and C because, both of them does not have any characteristics of a metal. They cannot conduct electricity, they are not flexible,as well as they are not hard as metals.
What will happen if copper wire is dipped in iron (II) sulphate solution?- a)Copper sulphate is formed
- b)Copper is formed
- c)Iron is formed
- d)No reaction
Correct answer is option 'D'. Can you explain this answer?
What will happen if copper wire is dipped in iron (II) sulphate solution?
a)
Copper sulphate is formed
b)
Copper is formed
c)
Iron is formed
d)
No reaction
|
Rajesh Joshi answered |
Reaction of Copper Wire with Iron (II) Sulphate Solution
When copper wire is dipped in iron (II) sulphate solution, the following observations can be made:
- The copper wire appears to be unchanged.
- The iron (II) sulphate solution remains blue-green in color.
Explanation:
The reason for no reaction taking place is due to the reactivity series of metals. Copper is less reactive than iron, which means copper cannot displace iron from its salt solution. Therefore, copper wire does not react with iron (II) sulphate solution.
The reaction can be represented as follows:
Cu (s) + FeSO4 (aq) → No reaction
Here, Cu represents copper, FeSO4 represents iron (II) sulphate, and (s) and (aq) indicate solid and aqueous states, respectively.
Conclusion:
Therefore, it can be concluded that no reaction takes place when copper wire is dipped in iron (II) sulphate solution.
When copper wire is dipped in iron (II) sulphate solution, the following observations can be made:
- The copper wire appears to be unchanged.
- The iron (II) sulphate solution remains blue-green in color.
Explanation:
The reason for no reaction taking place is due to the reactivity series of metals. Copper is less reactive than iron, which means copper cannot displace iron from its salt solution. Therefore, copper wire does not react with iron (II) sulphate solution.
The reaction can be represented as follows:
Cu (s) + FeSO4 (aq) → No reaction
Here, Cu represents copper, FeSO4 represents iron (II) sulphate, and (s) and (aq) indicate solid and aqueous states, respectively.
Conclusion:
Therefore, it can be concluded that no reaction takes place when copper wire is dipped in iron (II) sulphate solution.
Metals generally forms:- a)Basic oxides
- b)Acidic oxides
- c)Neutral oxides
- d)None
Correct answer is option 'A'. Can you explain this answer?
Metals generally forms:
a)
Basic oxides
b)
Acidic oxides
c)
Neutral oxides
d)
None
|
|
Aditi Saxena answered |
Metallic oxides are basic in nature because they react with dilute acids to form salt and water. They also react with water to form metal hydroxides which are alkaline in nature because these metal hydroxides release OH
− ions in solution. Therefore, non-metallic oxides would be acidic in nature.A metal which melts on the palm:- a)Zinc
- b)Gallium
- c)Sodium
- d)Potassium
Correct answer is option 'C'. Can you explain this answer?
A metal which melts on the palm:
a)
Zinc
b)
Gallium
c)
Sodium
d)
Potassium
|
|
Shubham Sharma answered |
The element gallium is an unexpected metal—it's a soft, silvery-white metal that is solid at room temperature (similar to aluminum) but it can literally melt in the palm of your hand.
What is the nature of the oxides which is formed when a metal reacts with oxygen?- a)Acidic
- b)Basic
- c)Neutral
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
What is the nature of the oxides which is formed when a metal reacts with oxygen?
a)
Acidic
b)
Basic
c)
Neutral
d)
None of these
|
Srishti Datta answered |
When a metal reacts with oxygen, it forms metal oxide. The nature of the oxide formed depends on the reactivity of the metal.
Explanation:
Reactivity of metals: Metals differ in their ability to react with oxygen, depending on their position in the reactivity series.
Reactivity series of metals: The reactivity series of metals is a list of metals arranged in the order of their decreasing reactivity with oxygen. The most reactive metal is placed at the top of the series, and the least reactive metal is placed at the bottom of the series.
The reactivity series of metals is as follows:
Potassium (K) > Sodium (Na) > Calcium (Ca) > Magnesium (Mg) > Aluminium (Al) > Zinc (Zn) > Iron (Fe) > Tin (Sn) > Lead (Pb) > Hydrogen (H) > Copper (Cu) > Silver (Ag) > Gold (Au)
When a metal reacts with oxygen, it forms metal oxide. The nature of the oxide formed depends on the reactivity of the metal.
Basic oxides: Metals that are more reactive than hydrogen (H) react with oxygen to form basic oxides. Basic oxides are also called alkaline oxides. They are soluble in water and turn litmus paper blue. Examples: Sodium oxide (Na2O), Calcium oxide (CaO), Magnesium oxide (MgO), Aluminium oxide (Al2O3), Potassium oxide (K2O).
Neutral oxides: Metals that are less reactive than hydrogen (H) react with oxygen to form neutral oxides. Neutral oxides are neither acidic nor basic. They do not show any effect on litmus paper. Examples: Zinc oxide (ZnO), Iron oxide (Fe2O3), Tin oxide (SnO2), Lead oxide (PbO).
Acidic oxides: Metals that are very less reactive or non-reactive with oxygen do not form oxides when they react with oxygen. However, metals like copper (Cu) and silver (Ag) form oxides that are acidic in nature. Acidic oxides react with water to form acidic solutions. For example, copper oxide (CuO) is an acidic oxide.
Conclusion:
The nature of the oxide formed when a metal reacts with oxygen depends on the reactivity of the metal. Metals that are more reactive than hydrogen (H) form basic oxides. Metals that are less reactive than hydrogen (H) form neutral oxides. Metals that are very less reactive or non-reactive with oxygen do not form oxides, except for copper (Cu) and silver (Ag), which form acidic oxides.
Explanation:
Reactivity of metals: Metals differ in their ability to react with oxygen, depending on their position in the reactivity series.
Reactivity series of metals: The reactivity series of metals is a list of metals arranged in the order of their decreasing reactivity with oxygen. The most reactive metal is placed at the top of the series, and the least reactive metal is placed at the bottom of the series.
The reactivity series of metals is as follows:
Potassium (K) > Sodium (Na) > Calcium (Ca) > Magnesium (Mg) > Aluminium (Al) > Zinc (Zn) > Iron (Fe) > Tin (Sn) > Lead (Pb) > Hydrogen (H) > Copper (Cu) > Silver (Ag) > Gold (Au)
When a metal reacts with oxygen, it forms metal oxide. The nature of the oxide formed depends on the reactivity of the metal.
Basic oxides: Metals that are more reactive than hydrogen (H) react with oxygen to form basic oxides. Basic oxides are also called alkaline oxides. They are soluble in water and turn litmus paper blue. Examples: Sodium oxide (Na2O), Calcium oxide (CaO), Magnesium oxide (MgO), Aluminium oxide (Al2O3), Potassium oxide (K2O).
Neutral oxides: Metals that are less reactive than hydrogen (H) react with oxygen to form neutral oxides. Neutral oxides are neither acidic nor basic. They do not show any effect on litmus paper. Examples: Zinc oxide (ZnO), Iron oxide (Fe2O3), Tin oxide (SnO2), Lead oxide (PbO).
Acidic oxides: Metals that are very less reactive or non-reactive with oxygen do not form oxides when they react with oxygen. However, metals like copper (Cu) and silver (Ag) form oxides that are acidic in nature. Acidic oxides react with water to form acidic solutions. For example, copper oxide (CuO) is an acidic oxide.
Conclusion:
The nature of the oxide formed when a metal reacts with oxygen depends on the reactivity of the metal. Metals that are more reactive than hydrogen (H) form basic oxides. Metals that are less reactive than hydrogen (H) form neutral oxides. Metals that are very less reactive or non-reactive with oxygen do not form oxides, except for copper (Cu) and silver (Ag), which form acidic oxides.
Which metal is used in thermometers and barometers?- a)Mercury
- b)Iron
- c)Silver
- d)Gold
Correct answer is option 'A'. Can you explain this answer?
Which metal is used in thermometers and barometers?
a)
Mercury
b)
Iron
c)
Silver
d)
Gold
|
|
C K Academy answered |
Answer:
Metal used in thermometers and barometers:
- Mercury is the metal used in thermometers and barometers.
- It is a silvery-white heavy metal that is liquid at room temperature.
- Mercury is chosen for these instruments due to its unique properties, such as its high boiling point and low freezing point.
- It expands and contracts evenly with changes in temperature, making it ideal for measuring temperature accurately.
- In thermometers, the mercury inside the glass tube rises or falls depending on the temperature, allowing us to measure the temperature.
- In barometers, mercury is used to measure atmospheric pressure. The height of the mercury column in the barometer changes with variations in air pressure.
- The use of mercury in these instruments has become less common due to its toxicity and environmental concerns.
- Nowadays, digital thermometers and barometers have replaced mercury-based ones in many applications.
Metal used in thermometers and barometers:
- Mercury is the metal used in thermometers and barometers.
- It is a silvery-white heavy metal that is liquid at room temperature.
- Mercury is chosen for these instruments due to its unique properties, such as its high boiling point and low freezing point.
- It expands and contracts evenly with changes in temperature, making it ideal for measuring temperature accurately.
- In thermometers, the mercury inside the glass tube rises or falls depending on the temperature, allowing us to measure the temperature.
- In barometers, mercury is used to measure atmospheric pressure. The height of the mercury column in the barometer changes with variations in air pressure.
- The use of mercury in these instruments has become less common due to its toxicity and environmental concerns.
- Nowadays, digital thermometers and barometers have replaced mercury-based ones in many applications.
Which one of the following statements are correct?
Statement 1: metals are lustrous
Statement 2: non metals are not lustrous- a)Statement 1
- b)Statement 2
- c)Both statements are correct
- d)Both statements are incorrect
Correct answer is option 'C'. Can you explain this answer?
Which one of the following statements are correct?
Statement 1: metals are lustrous
Statement 2: non metals are not lustrous
Statement 1: metals are lustrous
Statement 2: non metals are not lustrous
a)
Statement 1
b)
Statement 2
c)
Both statements are correct
d)
Both statements are incorrect
|
|
C K Academy answered |
Statement 1: Metals are lustrous.
- Metals have a characteristic property of being lustrous, which means they have a shiny and reflective surface.
- This property is due to the presence of free electrons in the metallic structure, which allows the metals to reflect light and give them their characteristic shine.
- Examples of lustrous metals include gold, silver, copper, and aluminum.
Statement 2: Non-metals are not lustrous.
- Non-metals, on the other hand, generally do not have a shiny or reflective surface.
- They may appear dull, opaque, or have a matte finish.
- This is because non-metals lack the free electrons found in metals, which are responsible for reflecting light.
- Examples of non-lustrous non-metals include carbon, sulfur, nitrogen, and phosphorus.
Therefore, both statements are correct. Metals are lustrous, while non-metals are not lustrous.
Metals can be drawn into thin wires, this property of metal is known as:- a)Conductivity
- b)Ductility
- c)Malleability
- d)both (b) and (c)
Correct answer is option 'B'. Can you explain this answer?
Metals can be drawn into thin wires, this property of metal is known as:
a)
Conductivity
b)
Ductility
c)
Malleability
d)
both (b) and (c)
|
|
Ishan Singh answered |
Properties of Metals
Metals are a group of elements that possess certain characteristic properties which distinguish them from non-metals. Some of the key properties of metals are:
1. Conductivity: Metals are excellent conductors of heat and electricity. They have a high density of free electrons, which allows the easy flow of electric current and heat through the material.
2. Ductility: Ductility is the property of a material to be stretched into thin wires without breaking. Metals, such as copper and aluminum, exhibit high ductility and can be drawn into thin wires without losing their strength.
3. Malleability: Malleability is the property of a material to be easily hammered or rolled into thin sheets without breaking. Metals like gold and silver are highly malleable and can be beaten into thin foils.
Ductility and Malleability
Ductility and malleability are closely related properties, as both involve the ability of a material to undergo plastic deformation without fracture. However, there is a subtle difference between the two:
- Ductility specifically refers to the ability of a material to be drawn into wires, whereas
- Malleability refers to the ability of a material to be hammered or rolled into thin sheets.
Both properties are characteristic of metals due to their unique atomic structure and metallic bonding. The arrangement of metal atoms allows for the movement of atoms or ions within the crystal lattice, enabling the material to undergo plastic deformation without breaking.
Explanation for the Correct Answer
The correct answer for the given question is option 'B' - Ductility. This is because ductility specifically refers to the ability of metals to be drawn into thin wires. It is a distinct property of metals and is a result of their atomic structure and metallic bonding.
While conductivity is also a property of metals, it refers to their ability to conduct heat and electricity. Malleability, on the other hand, refers to the ability of metals to be hammered or rolled into thin sheets. While metals are both ductile and malleable, the property described in the question pertains specifically to ductility, making option 'B' the correct answer.
In conclusion, the property of metals that allows them to be drawn into thin wires is known as ductility. This property is a result of the unique atomic structure and metallic bonding present in metals.
Metals are a group of elements that possess certain characteristic properties which distinguish them from non-metals. Some of the key properties of metals are:
1. Conductivity: Metals are excellent conductors of heat and electricity. They have a high density of free electrons, which allows the easy flow of electric current and heat through the material.
2. Ductility: Ductility is the property of a material to be stretched into thin wires without breaking. Metals, such as copper and aluminum, exhibit high ductility and can be drawn into thin wires without losing their strength.
3. Malleability: Malleability is the property of a material to be easily hammered or rolled into thin sheets without breaking. Metals like gold and silver are highly malleable and can be beaten into thin foils.
Ductility and Malleability
Ductility and malleability are closely related properties, as both involve the ability of a material to undergo plastic deformation without fracture. However, there is a subtle difference between the two:
- Ductility specifically refers to the ability of a material to be drawn into wires, whereas
- Malleability refers to the ability of a material to be hammered or rolled into thin sheets.
Both properties are characteristic of metals due to their unique atomic structure and metallic bonding. The arrangement of metal atoms allows for the movement of atoms or ions within the crystal lattice, enabling the material to undergo plastic deformation without breaking.
Explanation for the Correct Answer
The correct answer for the given question is option 'B' - Ductility. This is because ductility specifically refers to the ability of metals to be drawn into thin wires. It is a distinct property of metals and is a result of their atomic structure and metallic bonding.
While conductivity is also a property of metals, it refers to their ability to conduct heat and electricity. Malleability, on the other hand, refers to the ability of metals to be hammered or rolled into thin sheets. While metals are both ductile and malleable, the property described in the question pertains specifically to ductility, making option 'B' the correct answer.
In conclusion, the property of metals that allows them to be drawn into thin wires is known as ductility. This property is a result of the unique atomic structure and metallic bonding present in metals.
Which non-metal is used as electrodes in electrolytic cells and dry cells?- a)Diamond
- b)Phosphorus
- c)Graphite
- d)Hydrogen
Correct answer is option 'C'. Can you explain this answer?
Which non-metal is used as electrodes in electrolytic cells and dry cells?
a)
Diamond
b)
Phosphorus
c)
Graphite
d)
Hydrogen
|
|
C K Academy answered |
Answer:
The non-metal that is commonly used as electrodes in electrolytic cells and dry cells is graphite. Graphite is a form of carbon that has a high electrical conductivity, making it suitable for use as an electrode material. It is widely used in various applications, including batteries and electrolytic cells, due to its unique properties.
Reasons why graphite is used as electrodes:
- High electrical conductivity: Graphite has a high number of delocalized electrons, which allows it to conduct electricity efficiently. This makes it ideal for use as an electrode material.
- Chemical stability: Graphite is chemically stable and resistant to corrosion, which is important for maintaining the integrity and longevity of the electrodes in electrolytic cells and dry cells.
- Low resistance: Graphite has a low resistance to the flow of electric current, reducing energy losses and ensuring efficient operation of the cells.
- Availability and cost-effectiveness: Graphite is readily available and relatively inexpensive, making it a practical choice for electrode materials in various applications.
Applications of graphite electrodes:
- Electrolytic cells: Graphite electrodes are used in electrolytic cells to facilitate chemical reactions through the conduction of electricity. These cells are commonly used in industries for processes such as electroplating, metal extraction, and electrolysis.
- Dry cells: Graphite electrodes are also used in dry cells, which are portable power sources commonly found in household batteries. The graphite electrode acts as the positive terminal and helps in the flow of electrons during the chemical reactions that generate electrical energy.
In conclusion, graphite is a non-metal that is widely used as electrodes in electrolytic cells and dry cells due to its high electrical conductivity, chemical stability, low resistance, and cost-effectiveness.
The non-metal that is commonly used as electrodes in electrolytic cells and dry cells is graphite. Graphite is a form of carbon that has a high electrical conductivity, making it suitable for use as an electrode material. It is widely used in various applications, including batteries and electrolytic cells, due to its unique properties.
Reasons why graphite is used as electrodes:
- High electrical conductivity: Graphite has a high number of delocalized electrons, which allows it to conduct electricity efficiently. This makes it ideal for use as an electrode material.
- Chemical stability: Graphite is chemically stable and resistant to corrosion, which is important for maintaining the integrity and longevity of the electrodes in electrolytic cells and dry cells.
- Low resistance: Graphite has a low resistance to the flow of electric current, reducing energy losses and ensuring efficient operation of the cells.
- Availability and cost-effectiveness: Graphite is readily available and relatively inexpensive, making it a practical choice for electrode materials in various applications.
Applications of graphite electrodes:
- Electrolytic cells: Graphite electrodes are used in electrolytic cells to facilitate chemical reactions through the conduction of electricity. These cells are commonly used in industries for processes such as electroplating, metal extraction, and electrolysis.
- Dry cells: Graphite electrodes are also used in dry cells, which are portable power sources commonly found in household batteries. The graphite electrode acts as the positive terminal and helps in the flow of electrons during the chemical reactions that generate electrical energy.
In conclusion, graphite is a non-metal that is widely used as electrodes in electrolytic cells and dry cells due to its high electrical conductivity, chemical stability, low resistance, and cost-effectiveness.
Metals are:- a)Semi conductor of heat and electricity
- b)Good conductor of heat and electricity
- c)Bad conductor of heat and electricity
- d)Good conductor of heat but bad conductor of electricity
Correct answer is option 'B'. Can you explain this answer?
Metals are:
a)
Semi conductor of heat and electricity
b)
Good conductor of heat and electricity
c)
Bad conductor of heat and electricity
d)
Good conductor of heat but bad conductor of electricity
|
Vedika Agnihotri answered |
Correct answer is b Because in metalls they are good conductor of heat and electricity as the number of electrons present in it
Which of the following is a basic oxide?- a)CaO
- b)CO2
- c)H2O
- d)N2O
Correct answer is option 'A'. Can you explain this answer?
Which of the following is a basic oxide?
a)
CaO
b)
CO2
c)
H2O
d)
N2O
|
Focus Academy answered |
Basic Oxides:
- Basic oxides are oxides that react with acids to form salts and water.
- They are also known as basic anhydrides.
- Basic oxides are typically metal oxides.
Based on the given options, let's analyze each oxide to determine if it is a basic oxide:
A. CaO:
- Calcium oxide (CaO) is a metal oxide.
- It reacts with acids to form salts and water.
- Therefore, CaO is a basic oxide.
B. CO2:
- Carbon dioxide (CO2) is not a metal oxide.
- It does not react with acids to form salts and water.
- Therefore, CO2 is not a basic oxide.
C. H2O:
- Water (H2O) is not a metal oxide.
- It does not react with acids to form salts and water.
- Therefore, H2O is not a basic oxide.
D. N2O:
- Nitrous oxide (N2O) is not a metal oxide.
- It does not react with acids to form salts and water.
- Therefore, N2O is not a basic oxide.
Conclusion:
- Among the given options, only CaO (Calcium oxide) is a basic oxide.
- Therefore, the correct answer is A: CaO.
- Basic oxides are oxides that react with acids to form salts and water.
- They are also known as basic anhydrides.
- Basic oxides are typically metal oxides.
Based on the given options, let's analyze each oxide to determine if it is a basic oxide:
A. CaO:
- Calcium oxide (CaO) is a metal oxide.
- It reacts with acids to form salts and water.
- Therefore, CaO is a basic oxide.
B. CO2:
- Carbon dioxide (CO2) is not a metal oxide.
- It does not react with acids to form salts and water.
- Therefore, CO2 is not a basic oxide.
C. H2O:
- Water (H2O) is not a metal oxide.
- It does not react with acids to form salts and water.
- Therefore, H2O is not a basic oxide.
D. N2O:
- Nitrous oxide (N2O) is not a metal oxide.
- It does not react with acids to form salts and water.
- Therefore, N2O is not a basic oxide.
Conclusion:
- Among the given options, only CaO (Calcium oxide) is a basic oxide.
- Therefore, the correct answer is A: CaO.
Which one the following statement (s) is correct?
Statement 1: metals are malleable and ductile
Statement 2: non metals are malleable and ductile- a)Statement 1
- b)Statement 2
- c)Both are correct
- d)Both are incorrect
Correct answer is option 'A'. Can you explain this answer?
Which one the following statement (s) is correct?
Statement 1: metals are malleable and ductile
Statement 2: non metals are malleable and ductile
Statement 1: metals are malleable and ductile
Statement 2: non metals are malleable and ductile
a)
Statement 1
b)
Statement 2
c)
Both are correct
d)
Both are incorrect
|
Sushil Solanki answered |
Explanation:
Metals and non-metals have different properties, including their malleability and ductility. Let's examine the statements:
Statement 1: Metals are malleable and ductile.
- Malleability is the ability of a material to be deformed into thin sheets without breaking. Metals are known for their malleability, which allows them to be hammered or rolled into different shapes.
- Ductility is the ability of a material to be drawn into thin wires without breaking. Metals also possess this property, which is why they are commonly used in electrical wiring.
Statement 2: Non-metals are malleable and ductile.
- This statement is incorrect. Non-metals, in general, are not malleable or ductile.
- Non-metals are usually brittle and lack the ability to be hammered into thin sheets or drawn into wires.
Conclusion:
The correct statement is Statement 1: Metals are malleable and ductile.
Therefore, the answer is A: Statement 1.
Metals and non-metals have different properties, including their malleability and ductility. Let's examine the statements:
Statement 1: Metals are malleable and ductile.
- Malleability is the ability of a material to be deformed into thin sheets without breaking. Metals are known for their malleability, which allows them to be hammered or rolled into different shapes.
- Ductility is the ability of a material to be drawn into thin wires without breaking. Metals also possess this property, which is why they are commonly used in electrical wiring.
Statement 2: Non-metals are malleable and ductile.
- This statement is incorrect. Non-metals, in general, are not malleable or ductile.
- Non-metals are usually brittle and lack the ability to be hammered into thin sheets or drawn into wires.
Conclusion:
The correct statement is Statement 1: Metals are malleable and ductile.
Therefore, the answer is A: Statement 1.
The property due to which non–metals break on hammering is called:- a)Ductility
- b)Malleability
- c)Brittleness
- d)Conductivity
Correct answer is option 'C'. Can you explain this answer?
The property due to which non–metals break on hammering is called:
a)
Ductility
b)
Malleability
c)
Brittleness
d)
Conductivity
|
|
Focus Academy answered |
Explanation:
The property due to which non-metals break on hammering is called brittleness. When a material is brittle, it means that it lacks the ability to deform plastically or to sustain significant elongation before fracture. Non-metals, such as ceramics and glass, are typically brittle in nature.
Here is a detailed explanation of the property of brittleness and why non-metals break on hammering:
Brittleness:
- Brittleness is the opposite of ductility and malleability. It refers to the property of a material to break or shatter when subjected to stress, without undergoing significant deformation.
- Brittle materials have a low tolerance for plastic deformation and tend to fracture when external forces are applied.
- The fracture in brittle materials occurs along a cleavage plane, resulting in a clean break with little or no plastic deformation.
Non-Metals:
- Non-metals are a class of elements that do not possess the characteristic properties of metals, such as high electrical conductivity, malleability, and ductility.
- Non-metals include elements like carbon, oxygen, nitrogen, sulfur, and many others.
- Most non-metals have a tendency to be brittle due to their atomic structure, which consists of covalent bonds that are stronger and less flexible than metallic bonds.
Hammering:
- Hammering or striking a material with a hammer applies an external force to the material, causing it to undergo stress and deformation.
- When non-metals are subjected to hammering, their lack of ductility and malleability prevents them from undergoing plastic deformation.
- Instead, the applied stress causes the brittle material to fracture and break into smaller pieces.
Therefore, the property responsible for non-metals breaking on hammering is brittleness.
The property due to which non-metals break on hammering is called brittleness. When a material is brittle, it means that it lacks the ability to deform plastically or to sustain significant elongation before fracture. Non-metals, such as ceramics and glass, are typically brittle in nature.
Here is a detailed explanation of the property of brittleness and why non-metals break on hammering:
Brittleness:
- Brittleness is the opposite of ductility and malleability. It refers to the property of a material to break or shatter when subjected to stress, without undergoing significant deformation.
- Brittle materials have a low tolerance for plastic deformation and tend to fracture when external forces are applied.
- The fracture in brittle materials occurs along a cleavage plane, resulting in a clean break with little or no plastic deformation.
Non-Metals:
- Non-metals are a class of elements that do not possess the characteristic properties of metals, such as high electrical conductivity, malleability, and ductility.
- Non-metals include elements like carbon, oxygen, nitrogen, sulfur, and many others.
- Most non-metals have a tendency to be brittle due to their atomic structure, which consists of covalent bonds that are stronger and less flexible than metallic bonds.
Hammering:
- Hammering or striking a material with a hammer applies an external force to the material, causing it to undergo stress and deformation.
- When non-metals are subjected to hammering, their lack of ductility and malleability prevents them from undergoing plastic deformation.
- Instead, the applied stress causes the brittle material to fracture and break into smaller pieces.
Therefore, the property responsible for non-metals breaking on hammering is brittleness.
What is the nature of the oxide which is formed when a non-metal reacts with oxygen?- a)Acidic
- b)Basic
- c)neutral
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
What is the nature of the oxide which is formed when a non-metal reacts with oxygen?
a)
Acidic
b)
Basic
c)
neutral
d)
None of these
|
Priyanka Mishra answered |
When a non-metal reacts with oxygen, it forms an oxide. The nature of the oxide formed depends on the non-metal involved in the reaction.
Acidic Nature of Non-Metal Oxides:
Non-metals tend to form acidic oxides when they react with oxygen. This is because non-metal oxides react with water to form acids. For example, sulfur dioxide (SO2) is a non-metal oxide that reacts with water to form sulfuric acid (H2SO4). Similarly, nitrogen dioxide (NO2) reacts with water to form nitric acid (HNO3).
Basic Nature of Metal Oxides:
In contrast, metals tend to form basic oxides when they react with oxygen. Metal oxides react with water to form bases. For example, sodium oxide (Na2O) is a metal oxide that reacts with water to form sodium hydroxide (NaOH). Similarly, calcium oxide (CaO) reacts with water to form calcium hydroxide (Ca(OH)2).
Neutral Nature of Some Oxides:
Some oxides are neutral in nature and do not react with water to form either an acid or a base. For example, carbon dioxide (CO2) is a neutral oxide.
Conclusion:
Thus, the nature of the oxide formed when a non-metal reacts with oxygen is usually acidic.
Acidic Nature of Non-Metal Oxides:
Non-metals tend to form acidic oxides when they react with oxygen. This is because non-metal oxides react with water to form acids. For example, sulfur dioxide (SO2) is a non-metal oxide that reacts with water to form sulfuric acid (H2SO4). Similarly, nitrogen dioxide (NO2) reacts with water to form nitric acid (HNO3).
Basic Nature of Metal Oxides:
In contrast, metals tend to form basic oxides when they react with oxygen. Metal oxides react with water to form bases. For example, sodium oxide (Na2O) is a metal oxide that reacts with water to form sodium hydroxide (NaOH). Similarly, calcium oxide (CaO) reacts with water to form calcium hydroxide (Ca(OH)2).
Neutral Nature of Some Oxides:
Some oxides are neutral in nature and do not react with water to form either an acid or a base. For example, carbon dioxide (CO2) is a neutral oxide.
Conclusion:
Thus, the nature of the oxide formed when a non-metal reacts with oxygen is usually acidic.
The tip of lead pencil is made of:- a)Lead
- b)Zinc
- c)Charcoal
- d)Graphite
Correct answer is option 'D'. Can you explain this answer?
The tip of lead pencil is made of:
a)
Lead
b)
Zinc
c)
Charcoal
d)
Graphite
|
Skyhigh Academy answered |
The tip of a lead pencil is made of graphite.
Graphite is a form of carbon that is commonly used in pencils due to its unique properties. Here is a detailed explanation:
Properties of Graphite:
- Graphite is a soft and brittle material.
- It has a metallic gray color and a slippery texture.
- Graphite is a good conductor of electricity.
Why is Graphite used in pencils?
- Graphite leaves a mark on paper when it is applied due to its ability to leave a layer of graphite particles on the surface.
- It has a low friction coefficient, which means it can easily glide across the paper.
- Graphite is easily erasable, making it suitable for writing and drawing purposes.
Manufacturing Process:
- The process of making a pencil tip involves mixing graphite with clay binders and water to form a paste-like mixture.
- The mixture is then extruded into thin rods and dried.
- These dried rods are then inserted into a wooden or plastic casing to form the pencil.
Conclusion:
- The tip of a lead pencil is made of graphite, which is a form of carbon.
- Graphite's unique properties make it ideal for writing and drawing purposes.
- Its ability to leave a mark on paper, low friction coefficient, and erasability are the reasons why it is commonly used in pencils.
Graphite is a form of carbon that is commonly used in pencils due to its unique properties. Here is a detailed explanation:
Properties of Graphite:
- Graphite is a soft and brittle material.
- It has a metallic gray color and a slippery texture.
- Graphite is a good conductor of electricity.
Why is Graphite used in pencils?
- Graphite leaves a mark on paper when it is applied due to its ability to leave a layer of graphite particles on the surface.
- It has a low friction coefficient, which means it can easily glide across the paper.
- Graphite is easily erasable, making it suitable for writing and drawing purposes.
Manufacturing Process:
- The process of making a pencil tip involves mixing graphite with clay binders and water to form a paste-like mixture.
- The mixture is then extruded into thin rods and dried.
- These dried rods are then inserted into a wooden or plastic casing to form the pencil.
Conclusion:
- The tip of a lead pencil is made of graphite, which is a form of carbon.
- Graphite's unique properties make it ideal for writing and drawing purposes.
- Its ability to leave a mark on paper, low friction coefficient, and erasability are the reasons why it is commonly used in pencils.
The most abundant metal on the earth is- a)Aluminium
- b)Gold
- c)Copper
- d)Iron
Correct answer is option 'A'. Can you explain this answer?
The most abundant metal on the earth is
a)
Aluminium
b)
Gold
c)
Copper
d)
Iron
|
Celin Santhosh answered |
Due to the eight percent of the earth's crust being aluminium, it is one of the most abundant metals on earth. However. It is always found combined with various other elements, never by itself in its free state. The most frequently encountered ores are Bauxite, Corundum, Feldspar, Cryolite, Alunite and Kaolin etc.
Which one of the following is a metal?- a)Gold
- b)Silver
- c)Aluminum
- d)all of these
Correct answer is option 'D'. Can you explain this answer?
Which one of the following is a metal?
a)
Gold
b)
Silver
c)
Aluminum
d)
all of these
|
|
Deepa Rawat answered |
Option D
Because Gold, silver and aluminium has all the important physical properties of metals.
Because Gold, silver and aluminium has all the important physical properties of metals.
Sodium is a:- a)Colourless and hard metal
- b)Silvery white and very soft metal
- c)Silvery white and hard metal
- d)Colourless and soft metal
Correct answer is option 'B'. Can you explain this answer?
Sodium is a:
a)
Colourless and hard metal
b)
Silvery white and very soft metal
c)
Silvery white and hard metal
d)
Colourless and soft metal
|
|
C K Academy answered |
Sodium is a:
- Sodium is a silvery white and very soft metal.
- It is one of the alkali metals and belongs to the group 1 (or 1A) elements in the periodic table.
- Sodium has a low melting point and is easily cut with a knife.
- It is highly reactive and reacts vigorously with water, releasing hydrogen gas and forming sodium hydroxide.
- In its pure form, sodium is not found in nature, but it is commonly found in compounds such as sodium chloride (table salt) and sodium bicarbonate (baking soda).
- Sodium is an essential element for many biological processes and is necessary for maintaining proper fluid balance, nerve function, and muscle contraction in the human body.
- It is commonly used in various industries, including the production of chemicals, soaps, detergents, and as a coolant in nuclear reactors.
- Sodium compounds are also used in food preservation, water treatment, and as a flavor enhancer in processed foods.
- However, excessive sodium intake can be harmful to health and is associated with high blood pressure and an increased risk of cardiovascular diseases.
- Sodium is a silvery white and very soft metal.
- It is one of the alkali metals and belongs to the group 1 (or 1A) elements in the periodic table.
- Sodium has a low melting point and is easily cut with a knife.
- It is highly reactive and reacts vigorously with water, releasing hydrogen gas and forming sodium hydroxide.
- In its pure form, sodium is not found in nature, but it is commonly found in compounds such as sodium chloride (table salt) and sodium bicarbonate (baking soda).
- Sodium is an essential element for many biological processes and is necessary for maintaining proper fluid balance, nerve function, and muscle contraction in the human body.
- It is commonly used in various industries, including the production of chemicals, soaps, detergents, and as a coolant in nuclear reactors.
- Sodium compounds are also used in food preservation, water treatment, and as a flavor enhancer in processed foods.
- However, excessive sodium intake can be harmful to health and is associated with high blood pressure and an increased risk of cardiovascular diseases.
Which non metal is the hardest substance known?- a)Graphite
- b)Phosphorus
- c)Diamond
- d)Hydrogen
Correct answer is option 'C'. Can you explain this answer?
Which non metal is the hardest substance known?
a)
Graphite
b)
Phosphorus
c)
Diamond
d)
Hydrogen
|
|
C K Academy answered |
Non Metal Hardness:
The hardest substance known among non-metals is Diamond.
Explanation:
Diamond is a form of carbon and is considered the hardest known naturally occurring substance. Here is a detailed explanation:
Diamond Structure:
- Diamond is made up of carbon atoms arranged in a crystal lattice structure.
- Each carbon atom is bonded to four other carbon atoms in a tetrahedral arrangement, creating a strong and rigid network.
Hardness Scale:
- Hardness is measured using the Mohs scale, which ranks minerals based on their ability to scratch other minerals.
- The Mohs scale ranges from 1 to 10, with 10 being the hardest.
- Diamond has a hardness of 10 on the Mohs scale, making it the hardest known substance.
Properties of Diamond:
- Diamond has exceptional hardness due to its strong carbon-carbon bonds.
- It is highly resistant to scratching, making it suitable for industrial applications such as cutting, grinding, and polishing.
- Its hardness also gives diamond its renowned brilliance and ability to refract light.
Comparison to Other Options:
- Graphite: Graphite is a form of carbon as well, but it has a layered structure that makes it relatively soft and slippery. It has a Mohs hardness of around 1-2.
- Phosphorus: Phosphorus is a non-metal, but it is not known for its hardness. It has a Mohs hardness of around 2.5.
- Hydrogen: Hydrogen is a gas and does not possess a definitive hardness value.
Therefore, the correct answer is C: Diamond as it is the hardest known substance among non-metals.
The hardest substance known among non-metals is Diamond.
Explanation:
Diamond is a form of carbon and is considered the hardest known naturally occurring substance. Here is a detailed explanation:
Diamond Structure:
- Diamond is made up of carbon atoms arranged in a crystal lattice structure.
- Each carbon atom is bonded to four other carbon atoms in a tetrahedral arrangement, creating a strong and rigid network.
Hardness Scale:
- Hardness is measured using the Mohs scale, which ranks minerals based on their ability to scratch other minerals.
- The Mohs scale ranges from 1 to 10, with 10 being the hardest.
- Diamond has a hardness of 10 on the Mohs scale, making it the hardest known substance.
Properties of Diamond:
- Diamond has exceptional hardness due to its strong carbon-carbon bonds.
- It is highly resistant to scratching, making it suitable for industrial applications such as cutting, grinding, and polishing.
- Its hardness also gives diamond its renowned brilliance and ability to refract light.
Comparison to Other Options:
- Graphite: Graphite is a form of carbon as well, but it has a layered structure that makes it relatively soft and slippery. It has a Mohs hardness of around 1-2.
- Phosphorus: Phosphorus is a non-metal, but it is not known for its hardness. It has a Mohs hardness of around 2.5.
- Hydrogen: Hydrogen is a gas and does not possess a definitive hardness value.
Therefore, the correct answer is C: Diamond as it is the hardest known substance among non-metals.
Iron burns in air to form:- a)FeO
- b)FeO2
- c)Fe2O3
- d)Fe3O4
Correct answer is option 'C'. Can you explain this answer?
Iron burns in air to form:
a)
FeO
b)
FeO2
c)
Fe2O3
d)
Fe3O4
|
|
Skyhigh Academy answered |
Iron burns in air to form:
The correct answer is Fe2O3.
Explanation:
When iron (Fe) reacts with oxygen (O2) in the air, it undergoes a process known as oxidation, resulting in the formation of iron(III) oxide (Fe2O3).
Here is a step-by-step explanation of the reaction:
- Iron (Fe) atoms react with oxygen (O2) molecules.
- The iron atoms lose electrons and are oxidized to iron(III) ions (Fe3+).
- The oxygen molecules gain electrons and are reduced to oxide ions (O2-).
- The iron(III) ions combine with the oxide ions to form iron(III) oxide (Fe2O3).
Therefore, the correct chemical formula for the compound formed when iron burns in air is Fe2O3.
Arrange the following metal in increasing order of their reactivity towards water, zinc, Iron, Magnesium, Sodium.- a)Iron 〈 Zinc 〈 Magnesium 〈 Sodium
- b)Iron 〈 Magnesium 〈 Sodium 〈 Zinc
- c)Magnesium 〈 Iron 〈 Sodium 〈 Zinc
- d)Sodium 〈 Iron 〈 Magnesium 〈 Zinc
Correct answer is option 'A'. Can you explain this answer?
Arrange the following metal in increasing order of their reactivity towards water, zinc, Iron, Magnesium, Sodium.
a)
Iron 〈 Zinc 〈 Magnesium 〈 Sodium
b)
Iron 〈 Magnesium 〈 Sodium 〈 Zinc
c)
Magnesium 〈 Iron 〈 Sodium 〈 Zinc
d)
Sodium 〈 Iron 〈 Magnesium 〈 Zinc
|
|
Sushil Solanki answered |
To arrange the metals in increasing order of their reactivity towards water, we need to consider their position in the reactivity series. The reactivity series of metals is a list that ranks metals in order of their reactivity with water or acids.
The reactivity series is as follows:
1. Potassium
2. Sodium
3. Calcium
4. Magnesium
5. Aluminum
6. Zinc
7. Iron
8. Tin
9. Lead
10. Hydrogen
11. Copper
12. Mercury
13. Silver
14. Gold
15. Platinum
From the reactivity series, we can determine the order of reactivity of the given metals:
1. Sodium - Sodium is more reactive than all the other metals given.
2. Magnesium - Magnesium is more reactive than zinc and iron.
3. Zinc - Zinc is more reactive than iron.
4. Iron - Iron is the least reactive among the given metals.
Therefore, the correct order of increasing reactivity towards water for the given metals is:
Iron < zinc="">< magnesium=""><>
Hence, the answer is option A: Iron 〈 Zinc 〈 Magnesium 〈 Sodium.
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