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All questions of Metals and Non-metals for Class 9 Exam
Metal have ............no. of electrons in their outer most shell –
a)1 to 8b)7 to 9c)1 to 3d)10 to 12Correct answer is option 'C'. Can you explain this answer?
|
Gaurav Kumar answered |
Metals have 1-3 electrons in their outermost orbit. They are present on the extreme left of the periodic table. They tend to donate electrons and obtain the stable electronic configuration of the nearest noble gas. The valency on metals also ranges from 1-3 .
The best conductor of electricity among the following is:- a)Hg (Mercury)
- b)Al (Aluminum)
- c)Ag (Silver)
- d)Au (Gold)
Correct answer is option 'C'. Can you explain this answer?
The best conductor of electricity among the following is:
a)
Hg (Mercury)
b)
Al (Aluminum)
c)
Ag (Silver)
d)
Au (Gold)
|
Avinash Patel answered |
Metals are good conductors of electricity. silver is found in in pure form from the earth. so In the given options all are metals. Among them silver is the best conductor of electricity after second best conductor of electricity is gold.
Metal which is a poor conductor of heat is:- a)Zinc
- b)Lead
- c)Gold
- d)Copper
Correct answer is option 'B'. Can you explain this answer?
Metal which is a poor conductor of heat is:
a)
Zinc
b)
Lead
c)
Gold
d)
Copper
|
|
Anjana Khatri answered |
Although metals are supposed to be good conductors of electricity and heat,metals like mercury, lead, alloys of iron and chromium, titanium and stainless steel are poor conductors when compared to silver, copper and gold.
Identify the amphoteric oxide from the following:- a)MgO
- b)Na2O
- c)Al2O3
- d)K2O
Correct answer is option 'C'. Can you explain this answer?
Identify the amphoteric oxide from the following:
a)
MgO
b)
Na2O
c)
Al2O3
d)
K2O
|
|
Arun Sharma answered |
Amphoteric metal oxides react with both acids as well as bases to produce salt and water.
Aluminium oxide is an amphoteric oxide because it reacts with acids as well as bases and form salts and water.
Al2O3 + 6HCl → 2AlCl3 + 3H2O (Basic nature)
Aluminium Hydrochloric Aluminium Water
oxide acid chloride
Al2O3 + 2NaOH → 2NaAlO2 + H2O (Acidic nature)
Aluminium Sodium Sodium Water
oxide Hydroxide aluminate
All metals exist as solid at room temperature except the metal ‘X’. Name the metal “X’.- a)Tungsten
- b)Mercury
- c)Gold
- d)Potassium
Correct answer is option 'B'. Can you explain this answer?
All metals exist as solid at room temperature except the metal ‘X’. Name the metal “X’.
a)
Tungsten
b)
Mercury
c)
Gold
d)
Potassium
|
|
Ananya Das answered |
It is the only metal that is liquid at room temperature. It has the lowest melting point and boiling point of any other metal. It has low thermal conductivity, and a quite low electrical conductivity. It is the only metal that doesn’t form diatomic molecules in the gaseous phase.
Which metal is present in Calcium Hydroxide?- a)C
- b)O
- c)Ca
- d)H
Correct answer is option 'C'. Can you explain this answer?
Which metal is present in Calcium Hydroxide?
a)
C
b)
O
c)
Ca
d)
H
|
|
Amit Sharma answered |
Calcium hydroxide Ca ( OH) 2 , has calcium ( Ca) which is a metal.
Which of the following non-metal is good conductor of electricity?- a)Graphite
- b)Phosphorus
- c)Hydrogen
- d)Bromine
Correct answer is option 'A'. Can you explain this answer?
Which of the following non-metal is good conductor of electricity?
a)
Graphite
b)
Phosphorus
c)
Hydrogen
d)
Bromine
|
|
Gaurav Kumar answered |
Carbon, in the form of Graphite is a good conductor of electricity. It conducts heat and electricity like a metal or a metalloid.
Which is the least conductor of heat –- a)Gold
- b)Platinum
- c)Silver
- d)Lead
Correct answer is option 'D'. Can you explain this answer?
Which is the least conductor of heat –
a)
Gold
b)
Platinum
c)
Silver
d)
Lead
|
|
Abhavya Mishra answered |
Lead is an element having atomic no. 82.It is a poor conductor of heat because it easily reacts with the atmospheric oxygen and form lead oxide, and we know that metal oxide are poor conductor of heat and electricity.
What happens when non-metals react with water?a) Hydrogen gas is formedb) Carbon dioxide gas is formedc) Non-metals do not react with waterd) None of these.Correct answer is option 'C'. Can you explain this answer?
b) Carbon dioxide gas is formed
c) Non-metals do not react with water
d) None of these.
Correct answer is option 'C'. Can you explain this answer?
|
Pooja Shah answered |
Non - metals do not react with water to evolve hydrogen gas. ( no reaction)
A lustrous non-metal is:- a)Iodine
- b)Bromine
- c)Chlorine
- d)Sulphur
Correct answer is option 'A'. Can you explain this answer?
A lustrous non-metal is:
a)
Iodine
b)
Bromine
c)
Chlorine
d)
Sulphur
|
|
Pooja Shah answered |
Non - metals do not have luster. They do not reflect light from their surface ( except iodine and diamond) . So, here a lustrous now Metal is iodine.
The lustre of a metal is due to:- a)Its high density
- b)Presence of free electrons
- c)Its high polishing
- d)Its chemical inertness
Correct answer is option 'B'. Can you explain this answer?
The lustre of a metal is due to:
a)
Its high density
b)
Presence of free electrons
c)
Its high polishing
d)
Its chemical inertness
|
Rohini Seth answered |
The lustre of a metal is due to presence of free electrons.
It has to do with the way light and electrons on the surface of metals interact. The outer electrons in a metal are almost not bound to any individual atom, thus are relatively free, and are concentrated on the surface. These electrons (electron density) tend to oscillate at a collective frequency.
Which one of the following metal reacts vigorously with oxygen and water?
- a)Sodium
- b)Iron
- c)Calcium
- d)Magnesium
Correct answer is option 'A'. Can you explain this answer?
Which one of the following metal reacts vigorously with oxygen and water?
a)
Sodium
b)
Iron
c)
Calcium
d)
Magnesium
|
|
Ananya Das answered |
Sodium metal reacts vigorously with oxygen and water.
Non-metal generally form –- a)Anions
- b)Cations
- c)Ions
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Non-metal generally form –
a)
Anions
b)
Cations
c)
Ions
d)
None of these
|
Rajiv Gupta answered |
Nonmetals tend to form anions. With one, two, or three valence electrons metals tend to lose electrons to achieve a noble gas configuration. (It would require more energy to gain the 5 – 7 electrons needed to fill their valence shell.)
Which one of the following is a poor conductor of heat?- a)Mercury
- b)Zinc
- c)Silver
- d)Copper
Correct answer is option 'A'. Can you explain this answer?
Which one of the following is a poor conductor of heat?
a)
Mercury
b)
Zinc
c)
Silver
d)
Copper
|
|
Anjana Khatri answered |
Silver is best conductor of heat while among metals lead is poorest conductor of heat. Cooper and aluminum are good conductor while mercury is a poor conductor. Although metals are supposed to be good conductors of electricity and heat,metals like mercury, lead, alloys of iron and chromium, titanium and stainless steel are poor conductors.
The most malleable metal is –- a)Sodium
- b)Silium
- c)Gold
- d)Lead
Correct answer is option 'C'. Can you explain this answer?
The most malleable metal is –
a)
Sodium
b)
Silium
c)
Gold
d)
Lead
|
Neha Patel answered |
Gold is the most malleable of all metals; a single gram can be beaten into a sheet of 1 square meter, and an ounce into 300 square feet. Gold leaf can be beaten thin enough to become transparent." Pure Platinum is also quite plastic, as are pure Silver, pure copper, pure lead, and other metals.
Which non-metal have semi conductor property–- a)Boron
- b)Carbon
- c)Silicon
- d)Magnesium
Correct answer is option 'C'. Can you explain this answer?
Which non-metal have semi conductor property–
a)
Boron
b)
Carbon
c)
Silicon
d)
Magnesium
|
|
Arun Sharma answered |
Silicon is doped with other Microelements to increase its conductivity. It is used in transistors, solar cells, semiconductor devices.
MCQ (Multiple Choice Questions) or Practice Quiz with solutions of Chapter - "Metals and Non-Metals" of Class 10 Science, the questions are available for practice Q. By which reaction metal is obtained from metal oxide ?- a)Liquefaction
- b)Reduction
- c)Calcination
- d)Roasting
Correct answer is option 'B'. Can you explain this answer?
MCQ (Multiple Choice Questions) or Practice Quiz with solutions of Chapter - "Metals and Non-Metals" of Class 10 Science, the questions are available for practice
Q. By which reaction metal is obtained from metal oxide ?
a)
Liquefaction
b)
Reduction
c)
Calcination
d)
Roasting
|
Vikas Kumar answered |
The method used to extract metals from the ore in which they are found depends on their reactivity. For example, reactive metals such as aluminium are extracted by electrolysis, while a less-reactive metal such as iron may be extracted by reduction with carbon or carbon monoxide.
The property of metals by which they can be beaten in to thin sheets is called-- a)Malleability
- b)Ductility
- c)Conduction
- d)Expansion
Correct answer is option 'A'. Can you explain this answer?
The property of metals by which they can be beaten in to thin sheets is called-
a)
Malleability
b)
Ductility
c)
Conduction
d)
Expansion
|
Ishan Choudhury answered |
Malleability: The property of metals by which they can be beaten into thin sheets is known as malleability.
For example, silver metal is beaten to make silver foil used for decorating sweets.
For example, silver metal is beaten to make silver foil used for decorating sweets.
Which allotrope of carbon conducts electricity?- a)Graphite
- b)Diamond
- c)Fullerene
- d)Both Graphite and Diamond
Correct answer is option 'A'. Can you explain this answer?
Which allotrope of carbon conducts electricity?
a)
Graphite
b)
Diamond
c)
Fullerene
d)
Both Graphite and Diamond
|
|
Neha Patel answered |
Graphite conducts electricity, due to delocalization of the pi bond electrons above and below the planes of the carbon atoms. These electrons are free to move, so are able to conduct electricity. However, the electricity is only conducted along the plane of the layers.
Metal A when dipped in solution of salt of metal B ,then metal B is displaced . this shows that- a)Metal A is more reactive than metal B
- b)Metal B is more reactive than metal A
- c)Metal A and metal B are equally reactive
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Metal A when dipped in solution of salt of metal B ,then metal B is displaced . this shows that
a)
Metal A is more reactive than metal B
b)
Metal B is more reactive than metal A
c)
Metal A and metal B are equally reactive
d)
None of these
|
Kiran Mehta answered |
When metal A is dipped in a solution of salt of metal V, then metal B is displaced, this shows that metal A is more reactive than B. Only then it can displace B from its salt solution.
Which is the most abundant non-metal on the earth?- a)Sulphur
- b)Oxygen
- c)Silicon
- d)Phosphorus
Correct answer is option 'B'. Can you explain this answer?
Which is the most abundant non-metal on the earth?
a)
Sulphur
b)
Oxygen
c)
Silicon
d)
Phosphorus
|
Jaideep mukherjee answered |
Most Abundant Non-Metal on Earth:
Explanation:
Oxygen is the most abundant non-metal on Earth. It makes up around 21% of the Earth's atmosphere, and it is also found in the Earth's crust, oceans, and other compounds like water and rocks. Oxygen is essential for life as it is a key component of the air we breathe and is necessary for the respiration of living organisms.
Other Options:
Let's take a look at the other options and why they are not the most abundant non-metal on Earth:
a) Sulphur - Sulphur is a non-metal, but it is not the most abundant on Earth. Although it is found in large quantities in the Earth's crust and oceans, it is not as abundant as oxygen.
c) Silicon - Silicon is a non-metal that is found in the Earth's crust, but it is not as abundant as oxygen. It is often found in rocks and minerals like quartz and sand, but it is not as essential to life as oxygen.
d) Phosphorus - Phosphorus is a non-metal that is found in the Earth's crust, but it is not as abundant as oxygen. It is often used in fertilizers and is an important component of DNA, but it is not as essential to life as oxygen.
Conclusion:
In conclusion, oxygen is the most abundant non-metal on Earth. It is essential for life and is found in the Earth's atmosphere, crust, oceans, and other compounds.
Explanation:
Oxygen is the most abundant non-metal on Earth. It makes up around 21% of the Earth's atmosphere, and it is also found in the Earth's crust, oceans, and other compounds like water and rocks. Oxygen is essential for life as it is a key component of the air we breathe and is necessary for the respiration of living organisms.
Other Options:
Let's take a look at the other options and why they are not the most abundant non-metal on Earth:
a) Sulphur - Sulphur is a non-metal, but it is not the most abundant on Earth. Although it is found in large quantities in the Earth's crust and oceans, it is not as abundant as oxygen.
c) Silicon - Silicon is a non-metal that is found in the Earth's crust, but it is not as abundant as oxygen. It is often found in rocks and minerals like quartz and sand, but it is not as essential to life as oxygen.
d) Phosphorus - Phosphorus is a non-metal that is found in the Earth's crust, but it is not as abundant as oxygen. It is often used in fertilizers and is an important component of DNA, but it is not as essential to life as oxygen.
Conclusion:
In conclusion, oxygen is the most abundant non-metal on Earth. It is essential for life and is found in the Earth's atmosphere, crust, oceans, and other compounds.
Which of the following property is generally not shown by metals?- a)Electrical conduction
- b)Dullness
- c)Ductility
- d)Sonority
Correct answer is option 'B'. Can you explain this answer?
Which of the following property is generally not shown by metals?
a)
Electrical conduction
b)
Dullness
c)
Ductility
d)
Sonority
|
Mohini choudhary answered |
The properties that should have for a metal are sonority, lustrous, maellability ductility, heat and electrical conductivity as dullness is not one of them it is the correct option
Which of the following metals will not react with oxygen,even when heated very strongly in air?- a)Zn
- b)Al
- c)Ag
- d)Fe
Correct answer is option 'C'. Can you explain this answer?
Which of the following metals will not react with oxygen,even when heated very strongly in air?
a)
Zn
b)
Al
c)
Ag
d)
Fe
|
|
Ananya Das answered |
Silver do not react with oxygen even at high temperatures as they are less reactive and are placed below the reactivity series. Hence they are called noble metals. But silver fades after some months or years due to its tendency to react with sulphur in air forming their sulphides
A non-metallic oxide which is neutral in nature is- a)CO
- b)CO2
- c)P2O5
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
A non-metallic oxide which is neutral in nature is
a)
CO
b)
CO2
c)
P2O5
d)
None of these
|
|
Amit Sharma answered |
Non - metals generally form acidic oxides but oxides of carbon and nitrogen are neutral in nature like CO and NO.
NaHCO3 is chemical formula of –
- a)Sodium hydrogencarbonate
- b)Sodium carbonate
- c)Sodium hydroxide
- d)Sodium Chloride
Correct answer is option 'A'. Can you explain this answer?
NaHCO3 is chemical formula of –
a)
Sodium hydrogencarbonate
b)
Sodium carbonate
c)
Sodium hydroxide
d)
Sodium Chloride
|
|
Rahul Kapoor answered |
Sodium bicarbonate, also commonly known as baking soda, is commonly seen as a white, fine powder and has the chemical formula NaHCO3. It has one sodium atom, one hydrogen atom, one carbon atom, and three oxygen atoms. It is a very useful chemical that is alkaline in nature.
Which metal has high melting point- a)Sn
- b)W
- c)Sb
- d)Pb
Correct answer is option 'B'. Can you explain this answer?
Which metal has high melting point
a)
Sn
b)
W
c)
Sb
d)
Pb
|
|
Pooja Shah answered |
Of all metals in pure form, tungsten has the highest melting point (3,422 °C, 6,192 °F).
Which metal does not react with oxygen –- a)Cu
- b)Au
- c)A and B
- d)Fe
Correct answer is option 'B'. Can you explain this answer?
Which metal does not react with oxygen –
a)
Cu
b)
Au
c)
A and B
d)
Fe
|
|
Navya Shree N answered |
Aluminium will not react with oxygen whereas copper react with O2 and becomes green or dark layer. Iron reacts with O2 and a brown colour will be deposited on it which is none other than iron. whereas aluminium will not react with O2.
Cinnabar is an ore of –- a)Mercury
- b)Copper
- c)Calcium
- d)Lead
Correct answer is option 'A'. Can you explain this answer?
Cinnabar is an ore of –
a)
Mercury
b)
Copper
c)
Calcium
d)
Lead
|
|
Krishna Iyer answered |
Cinnabar is a toxic mercury sulfide mineral with a chemical composition of HgS. It is the only important ore of mercury. It has a bright red color that has caused people to use it as a pigment, and carve it into jewelry and ornaments for thousands of years in many parts of the world. Because it is toxic, its pigment and jewelry uses have almost been discontinued.
निम्नलिखित गद्यांशों को ध्यानपूर्वक पढ़कर नीचे दिए गए प्रश्नों के सही उत्तर विकल्पों में से चुनिए:
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस के कहाँ डूबने का भय लग रहा था?- a)झील में
- b)नदी में
- c)नाले में
- d)नहर में
Correct answer is option 'A'. Can you explain this answer?
निम्नलिखित गद्यांशों को ध्यानपूर्वक पढ़कर नीचे दिए गए प्रश्नों के सही उत्तर विकल्पों में से चुनिए:
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस के कहाँ डूबने का भय लग रहा था?
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस के कहाँ डूबने का भय लग रहा था?
a)
झील में
b)
नदी में
c)
नाले में
d)
नहर में
|
|
Amit Sharma answered |
The correct answer is A as
बस की रफ्तार तेज होने के कारण व्यक्ति को डर लग रहा था कि बस झील मे गोता लगा जाएगी।
बस की रफ्तार तेज होने के कारण व्यक्ति को डर लग रहा था कि बस झील मे गोता लगा जाएगी।
Carnallite is the mineral of –- a)Na
- b)Ca
- c)Mg
- d)All of these
Correct answer is option 'C'. Can you explain this answer?
Carnallite is the mineral of –
a)
Na
b)
Ca
c)
Mg
d)
All of these
|
|
Ravi Sharma answered |
Carnallite is an evaporite mineral a hydrated potassium magnesium chloride. It is variably colored yellow to white, reddish or blue. It occurs with a sequence of potassium and magnesium evaporite.
The constituent of hemoglobin is –
- a)Iron
- b)Sodium
- c)Copper
- d)Magnesium
Correct answer is option 'A'. Can you explain this answer?
The constituent of hemoglobin is –
a)
Iron
b)
Sodium
c)
Copper
d)
Magnesium
|
|
Ananya Das answered |
Iron is an essential element for blood production. About 70 percent of your body's iron is found in the red blood cells of your blood called hameoglobin.
Which oxide is neutral ?- a)NO2
- b)MgO
- c)H2O
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
Which oxide is neutral ?
a)
NO2
b)
MgO
c)
H2O
d)
None of these
|
|
Pooja Shah answered |
Neutral oxides show neither basic nor acidic properties and hence do not form salts when reacted with acids or bases, eg., water H2O, carbon monoxide CO etc. are neutral oxides.
The magnesium is used in –- a)Flash bulb
- b)Grignard reagent
- c)Electron alloy
- d)All of these
Correct answer is option 'D'. Can you explain this answer?
The magnesium is used in –
a)
Flash bulb
b)
Grignard reagent
c)
Electron alloy
d)
All of these
|
|
Pooja Shah answered |
The magnesium is used in Flash bulb, Grignard reagent, Electron - alloy. When magnesium burns, it makes very bright white light. Elektron is an alloy containing magnesium (90%) , zinc, aluminum (9%) and other other Metals (1%) .
Which of the following elements is metalloid –- a)Si
- b)Sb
- c)A and B
- d)Zn
Correct answer is option 'C'. Can you explain this answer?
Which of the following elements is metalloid –
a)
Si
b)
Sb
c)
A and B
d)
Zn
|
|
Kuldeep Raj answered |
Option c is correct friend.
Because, Silicon (Si) and Antimony (Sb) are both elements which having a property that resembles both metals and non-metals.
As you know the definition of Metalloids, so what it states?. It states that the elements which having a properties between metals and non-metals right!. It (Si and Sb) can both act as either negative or positive. It can able to accept the electrons and gain the electrons. So this both elements having a properties like metals and non-metals. So, these both (Si and Sb) are both belongs to the Metalloids.
In the reaction M + O2 →MO2 (super oxide) the metal is -- a)Li
- b)Na
- c)K
- d)Ba
Correct answer is option 'C'. Can you explain this answer?
In the reaction M + O2 →MO2 (super oxide) the metal is -
a)
Li
b)
Na
c)
K
d)
Ba
|
|
Rohan Kapoor answered |
M + O2 -- MO2 (super oxide)
Metal that has tendency to form super oxide : K (Potassium due to its large size)
The metal that can be easily cut by knife is:- a)Sodium
- b)Copper
- c)Magnesium
- d)Iron
Correct answer is option 'A'. Can you explain this answer?
The metal that can be easily cut by knife is:
a)
Sodium
b)
Copper
c)
Magnesium
d)
Iron
|
|
Rajiv Gupta answered |
Sodium is an alkali metal and is so soft that it can be easily cut by knife.
Which is the least conductor of heat –- a)Gold
- b)Platinum
- c)Silver
- d)Lead
Correct answer is option 'D'. Can you explain this answer?
Which is the least conductor of heat –
a)
Gold
b)
Platinum
c)
Silver
d)
Lead
|
|
Krishna Iyer answered |
Lead being metal is a bad conductor of electricity and heat. Compared to other metals, lead is a poor conductor of heat while gold, silver, platinum are good conductors of heat.
The sodium metal can be stored in –- a)Benzene
- b)Alcohol
- c)Kerosene
- d)Toluene
Correct answer is option 'C'. Can you explain this answer?
The sodium metal can be stored in –
a)
Benzene
b)
Alcohol
c)
Kerosene
d)
Toluene
|
|
Neha Patel answered |
Sodium is stored under kerosene because of its high chemical reactivity with almost all of other elements (for example oxygen from air which oxidizes it instantly). Kerosene and mineral oil are the only chemicals that make the sodium inert.
Which hydride commercially known as hydrolith –
- a)MgH2
- b)CaH2
- c)NaH
- d)KH
Correct answer is option 'B'. Can you explain this answer?
Which hydride commercially known as hydrolith –
a)
M
g
H2b)
C
a
H2c)
NaH
d)
KH
|
|
Amit Kumar answered |
Calcium hydride is called hydrolith because C
a
H2 is a saline hydride,meaning that its structure is salt-like.The non-metal which is a liquid at room temperature–- a)Oxygen
- b)Fluorine
- c)Sulphur
- d)Bromine
Correct answer is option 'D'. Can you explain this answer?
The non-metal which is a liquid at room temperature–
a)
Oxygen
b)
Fluorine
c)
Sulphur
d)
Bromine
|
Armaanian Sonal answered |
Bromine is the only non-metal at room temperature because the intermolecular forces are strong enough so that it does not vaporize at room temperature.
The most abundant metal in the earth crust is – - a)Al
- b)Fe
- c)O
- d)Cu
Correct answer is option 'A'. Can you explain this answer?
The most abundant metal in the earth crust is –
a)
Al
b)
Fe
c)
O
d)
Cu
|
|
Krishna Iyer answered |
The most abundant Element on the earth's crust is oxygen followed by silicon.. But both of them are Non-metals. But, silicon is followed by Aluminium which is a METAL (about 8.23%) further followed by iron. So the most abundant metal found on the Earth is Aluminium.
The non-metal which is a liquid at room temperature–- a)Oxygen
- b)Fluorine
- c)Sulphur
- d)Bromine
Correct answer is option 'D'. Can you explain this answer?
The non-metal which is a liquid at room temperature–
a)
Oxygen
b)
Fluorine
c)
Sulphur
d)
Bromine
|
|
Abhishek Phogat answered |
Bromine is liquid at room temperature...
The property of metal by which it can be drawn into wires is called- a)Conductivity
- b)Malleability
- c)Ductility
- d)Decorating
Correct answer is option 'C'. Can you explain this answer?
The property of metal by which it can be drawn into wires is called
a)
Conductivity
b)
Malleability
c)
Ductility
d)
Decorating
|
|
Nishu Deshwal answered |
Ductility is correct. Ex- copper, it's used in electric wires because of it's property of ductility and conductivity.
Which chemical is known as king of chemicals –- a)H2CO3
- b)HCl
- c)CH3COOH
- d)H2SO4
Correct answer is option 'D'. Can you explain this answer?
Which chemical is known as king of chemicals –
a)
H2CO3
b)
HCl
c)
CH3COOH
d)
H2SO4
|
|
Krishna Iyer answered |
Sulfuric acid is commonly supplied at concentrations of 78, 93 or 98 percent. Sulphuric acid is sometimes referred to as the " King of chemicals " because it is produced.
निम्नलिखित गद्यांशों को ध्यानपूर्वक पढ़कर नीचे दिए गए प्रश्नों के सही उत्तर विकल्पों में से चुनिए:
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस की रफ्तार के बारे में क्या बताया गया है?- a)बढ़ रही थी
- b)कम होती जा रही थी
- c)ज्यों-की-त्यों थी
- d)इनमें से कोई नहीं
Correct answer is option 'B'. Can you explain this answer?
निम्नलिखित गद्यांशों को ध्यानपूर्वक पढ़कर नीचे दिए गए प्रश्नों के सही उत्तर विकल्पों में से चुनिए:
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस की रफ्तार के बारे में क्या बताया गया है?
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस की रफ्तार के बारे में क्या बताया गया है?
a)
बढ़ रही थी
b)
कम होती जा रही थी
c)
ज्यों-की-त्यों थी
d)
इनमें से कोई नहीं
|
|
Kavya Saxena answered |
B is the correct option.बस की रफ्तार कम होती जा रही थी.
An iron nail is dipped in copper sulphate solution. It is observed that- a)The colour of the solution remain unchanged
- b)The colour of the solution becomes red .
- c)The colour of the solution turns to light green
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
An iron nail is dipped in copper sulphate solution. It is observed that
a)
The colour of the solution remain unchanged
b)
The colour of the solution becomes red .
c)
The colour of the solution turns to light green
d)
None of these
|
|
Kajol nair answered |
Introduction:
When an iron nail is dipped in copper sulphate solution, a chemical reaction takes place between the iron and the copper sulphate. This reaction results in the formation of a new compound and a change in the color of the solution. Let's understand the process in detail.
Explanation:
1. Reaction between iron and copper sulphate:
When the iron nail is dipped in copper sulphate solution, the following reaction takes place:
Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
In this reaction, iron displaces copper from copper sulphate, resulting in the formation of iron sulphate and copper metal. This reaction is also known as a displacement reaction.
2. Change in color:
The color of the solution changes due to the formation of iron sulphate. Iron sulphate is a light green compound, which gives the solution a light green color. Therefore, the correct answer is option 'C' - the color of the solution turns light green.
3. Explanation of other options:
a) The color of the solution remains unchanged: This option is incorrect because a chemical reaction occurs, resulting in the formation of a new compound and a change in color.
b) The color of the solution becomes red: This option is incorrect because copper sulphate is blue in color, and the reaction with iron does not produce a red color.
d) None of these: This option is incorrect because the correct answer is option 'C', as explained above.
Conclusion:
When an iron nail is dipped in copper sulphate solution, the color of the solution turns light green due to the formation of iron sulphate. This is a result of a displacement reaction between iron and copper sulphate. It is important to understand the chemical reactions that occur during such experiments to grasp the concepts of displacement reactions and the formation of new compounds.
When an iron nail is dipped in copper sulphate solution, a chemical reaction takes place between the iron and the copper sulphate. This reaction results in the formation of a new compound and a change in the color of the solution. Let's understand the process in detail.
Explanation:
1. Reaction between iron and copper sulphate:
When the iron nail is dipped in copper sulphate solution, the following reaction takes place:
Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
In this reaction, iron displaces copper from copper sulphate, resulting in the formation of iron sulphate and copper metal. This reaction is also known as a displacement reaction.
2. Change in color:
The color of the solution changes due to the formation of iron sulphate. Iron sulphate is a light green compound, which gives the solution a light green color. Therefore, the correct answer is option 'C' - the color of the solution turns light green.
3. Explanation of other options:
a) The color of the solution remains unchanged: This option is incorrect because a chemical reaction occurs, resulting in the formation of a new compound and a change in color.
b) The color of the solution becomes red: This option is incorrect because copper sulphate is blue in color, and the reaction with iron does not produce a red color.
d) None of these: This option is incorrect because the correct answer is option 'C', as explained above.
Conclusion:
When an iron nail is dipped in copper sulphate solution, the color of the solution turns light green due to the formation of iron sulphate. This is a result of a displacement reaction between iron and copper sulphate. It is important to understand the chemical reactions that occur during such experiments to grasp the concepts of displacement reactions and the formation of new compounds.
Which compound is used in photography –- a)AgNO3
- b)Ag2O
- c)AgBr
- d)Ag3N
Correct answer is option 'C'. Can you explain this answer?
Which compound is used in photography –
a)
AgNO3
b)
Ag2O
c)
AgBr
d)
Ag3N
|
|
Sandeep Kumar answered |
As we know that,
AgBr is a soft pale yellow, water insoluble salt well known (along with other silver halides)
for its unusual sensitivity to light.
It also have b used for making the shroud of Turin.
this is the reason hope you have got the answer all the best.
AgBr is a soft pale yellow, water insoluble salt well known (along with other silver halides)
for its unusual sensitivity to light.
It also have b used for making the shroud of Turin.
this is the reason hope you have got the answer all the best.
Which of the following metals is extracted only by electrolysis?- a)Zn
- b)Al
- c)Fe
- d)Cu
Correct answer is option 'B'. Can you explain this answer?
Which of the following metals is extracted only by electrolysis?
a)
Zn
b)
Al
c)
Fe
d)
Cu
|
Anmol tiwari answered |
Electrolysis and Metal Extraction
Electrolysis is a process that uses an electric current to drive a non-spontaneous chemical reaction. It is commonly used for metal extraction from their ores. During electrolysis, the metal ions present in the compound are reduced at the cathode (negative electrode), while oxidation occurs at the anode (positive electrode).
Aluminium Extraction
Aluminium is extracted through the process of electrolysis. It is obtained from its ore, bauxite, which is primarily composed of aluminium oxide (Al2O3). The extraction of aluminium involves the following steps:
1. Extraction of Alumina: Bauxite ore is first purified to obtain alumina (Al2O3) through the Bayer's process. In this process, bauxite is dissolved in sodium hydroxide (NaOH) solution, and impurities are removed. The resulting solution is then cooled and filtered to obtain pure alumina.
2. Electrolysis of Alumina: The alumina obtained in the previous step is mixed with cryolite (Na3AlF6) and heated to form a molten electrolyte. This mixture reduces the melting point of alumina, making the electrolysis process more efficient. The molten electrolyte is then electrolyzed using carbon electrodes.
At the cathode: Aluminium ions (Al3+) are reduced and deposited as molten aluminium metal (Al).
At the anode: Oxygen ions (O2-) are oxidized to form oxygen gas (O2).
Since aluminium extraction involves the use of electrolysis, it is the correct answer for the given question.
Other Metals Extraction
- Zinc (Zn): Zinc is not extracted by electrolysis. It is primarily obtained from its ore, zinc blende (ZnS), through a process called roasting and smelting.
- Iron (Fe): Iron is extracted from its ore, hematite (Fe2O3), through a process called reduction with carbon. Electrolysis is not involved in the extraction of iron.
- Copper (Cu): Copper is primarily obtained from its ore, copper pyrite (CuFeS2), through a process called smelting. Electrolysis is not used in the extraction of copper.
Therefore, among the given options, aluminium (Al) is the only metal that is extracted using electrolysis.
Electrolysis is a process that uses an electric current to drive a non-spontaneous chemical reaction. It is commonly used for metal extraction from their ores. During electrolysis, the metal ions present in the compound are reduced at the cathode (negative electrode), while oxidation occurs at the anode (positive electrode).
Aluminium Extraction
Aluminium is extracted through the process of electrolysis. It is obtained from its ore, bauxite, which is primarily composed of aluminium oxide (Al2O3). The extraction of aluminium involves the following steps:
1. Extraction of Alumina: Bauxite ore is first purified to obtain alumina (Al2O3) through the Bayer's process. In this process, bauxite is dissolved in sodium hydroxide (NaOH) solution, and impurities are removed. The resulting solution is then cooled and filtered to obtain pure alumina.
2. Electrolysis of Alumina: The alumina obtained in the previous step is mixed with cryolite (Na3AlF6) and heated to form a molten electrolyte. This mixture reduces the melting point of alumina, making the electrolysis process more efficient. The molten electrolyte is then electrolyzed using carbon electrodes.
At the cathode: Aluminium ions (Al3+) are reduced and deposited as molten aluminium metal (Al).
At the anode: Oxygen ions (O2-) are oxidized to form oxygen gas (O2).
Since aluminium extraction involves the use of electrolysis, it is the correct answer for the given question.
Other Metals Extraction
- Zinc (Zn): Zinc is not extracted by electrolysis. It is primarily obtained from its ore, zinc blende (ZnS), through a process called roasting and smelting.
- Iron (Fe): Iron is extracted from its ore, hematite (Fe2O3), through a process called reduction with carbon. Electrolysis is not involved in the extraction of iron.
- Copper (Cu): Copper is primarily obtained from its ore, copper pyrite (CuFeS2), through a process called smelting. Electrolysis is not used in the extraction of copper.
Therefore, among the given options, aluminium (Al) is the only metal that is extracted using electrolysis.
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