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What is the physical state of water at 100°C?
- a)both gaseous and liquid state
- b)solid state
- c)liquid state
- d)gaseous state
Correct answer is option 'A'. Can you explain this answer?
What is the physical state of water at 100°C?
a)
both gaseous and liquid state
b)
solid state
c)
liquid state
d)
gaseous state
|
Arvind Singh answered |
At 100°C, water exists in both the liquid state as well as in gaseous state. This is special condition because 100°C is the boiling point of water and as well as liquefaction temperature of the water vapour
Can you explain the answer of this question below:Transpiration from the leaves of trees is an example of:- A:Evaporation
- B:Sublimation
- C:Condensation
- D:Diffusion
The answer is a.
Transpiration from the leaves of trees is an example of:
A:
Evaporation
B:
Sublimation
C:
Condensation
D:
Diffusion
|
|
Amit Sharma answered |
Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. Transpiration is essentially evaporation of water from plant leaves.
The formation of water from oxygen and hydrogen is a _______ .- a)Physical change
- b)Chemical change
- c)Reversible change
- d)Both Physical and Reversible change
Correct answer is option 'B'. Can you explain this answer?
The formation of water from oxygen and hydrogen is a _______ .
a)
Physical change
b)
Chemical change
c)
Reversible change
d)
Both Physical and Reversible change
|
Jaideep Sharma answered |
Chemical Change:
When hydrogen and oxygen combine to form water, a new substance with different properties is formed. This is a chemical change.
Explanation:
Chemical change is a process in which one or more substances are changed into new substances with different physical and chemical properties. In the formation of water from hydrogen and oxygen, the hydrogen and oxygen molecules bond together to form a new molecule of water. This reaction is accompanied by the release of energy in the form of heat and light.
The chemical equation for the reaction is:
2H2 + O2 → 2H2O
Here, two molecules of hydrogen (H2) and one molecule of oxygen (O2) combine to form two molecules of water (H2O).
Reversible Change:
The formation of water from hydrogen and oxygen is not a reversible change. Once the reaction takes place, it is not possible to separate the water molecules back into hydrogen and oxygen.
Conclusion:
Hence, the correct option is B. Chemical change.
When hydrogen and oxygen combine to form water, a new substance with different properties is formed. This is a chemical change.
Explanation:
Chemical change is a process in which one or more substances are changed into new substances with different physical and chemical properties. In the formation of water from hydrogen and oxygen, the hydrogen and oxygen molecules bond together to form a new molecule of water. This reaction is accompanied by the release of energy in the form of heat and light.
The chemical equation for the reaction is:
2H2 + O2 → 2H2O
Here, two molecules of hydrogen (H2) and one molecule of oxygen (O2) combine to form two molecules of water (H2O).
Reversible Change:
The formation of water from hydrogen and oxygen is not a reversible change. Once the reaction takes place, it is not possible to separate the water molecules back into hydrogen and oxygen.
Conclusion:
Hence, the correct option is B. Chemical change.
What is the physical state of water at100C?- a)Liquid
- b)Solid
- c)gas
- d)All of these
Correct answer is 'B'. Can you explain this answer?
What is the physical state of water at100C?
a)
Liquid
b)
Solid
c)
gas
d)
All of these
|
|
Arjun Sharma answered |
The answer is a .
The physical state of water at its boiling point temperature of 100 degree Celsius will be both liquid state as well as gaseous state. This is because at its boiling point of 100 degree celsius the liquid state of water starts changing into its Gaseous state (steam).
The change of state from solid to liquid known as –
- a)Melting
- b)Boiling
- c)Sublimation
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
The change of state from solid to liquid known as –
a)
Melting
b)
Boiling
c)
Sublimation
d)
None of these
|
|
Amit Sharma answered |
The change of state from solid to liquid is known as Melting. This is a process in which a solid substance changes into a liquid on heating. Heat energy is required to break the bonds between molecules, allowing them to move around freely. This process is also known as fusion, and the amount of energy required is called the latent heat of fusion. In a phase diagram such as Figure 12.4.1, the melting point is the temperature at which a substance can transition from a solid to a liquid.
Rate of diffusion is the fastest in- a)Solids
- b)Liquids
- c)Gases
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
Rate of diffusion is the fastest in
a)
Solids
b)
Liquids
c)
Gases
d)
None of these
|
|
Neeraj! answered |
Rate of diffusion is the fastest in Gases
Natural phenomenon like fog, mist or frost are caused due to:- a)Evaporation
- b)Transpiration
- c)Freezing
- d)Condensation
Correct answer is option 'D'. Can you explain this answer?
Natural phenomenon like fog, mist or frost are caused due to:
a)
Evaporation
b)
Transpiration
c)
Freezing
d)
Condensation
|
Jyoti Kapoor answered |
Fog, mist or frost are due to condensation, depending upon the physical conditions of atmosphere.
Which substance undergo sublimation process –
- a)Naphthalene
- b)Br2
- c)Ice
- d)N2
Correct answer is option 'A'. Can you explain this answer?
Which substance undergo sublimation process –
a)
Naphthalene
b)
Br
2c)
Ice
d)
N2
|
|
Ruhi Shah answered |
Some substances that undergo sublimation include dry ice (solid carbon dioxide), iodine, camphor, and napthalene.
Under which of the following conditions we can boil water at room temperature?
- a)At low pressure
- b)At moderate pressure
- c)At very high pressure
- d)At atmospheric pressure
Correct answer is option 'A'. Can you explain this answer?
Under which of the following conditions we can boil water at room temperature?
a)
At low pressure
b)
At moderate pressure
c)
At very high pressure
d)
At atmospheric pressure
|
Varun Kumar answered |
At low pressure
Explanation: Boiling occurs when the vapor pressure of a liquid equals the external pressure. At lower pressures, the boiling point of water decreases. So, if the external pressure is reduced significantly (below atmospheric pressure), water can boil at room temperature. This phenomenon can be observed in a vacuum chamber, where the pressure is significantly reduced, allowing water to boil at room temperature.
Explanation: Boiling occurs when the vapor pressure of a liquid equals the external pressure. At lower pressures, the boiling point of water decreases. So, if the external pressure is reduced significantly (below atmospheric pressure), water can boil at room temperature. This phenomenon can be observed in a vacuum chamber, where the pressure is significantly reduced, allowing water to boil at room temperature.
An Almirah is a solid because its- a)hard and rigid
- b)shape doesn’t change when pressed
- c)density is very high
- d)All of these
Correct answer is 'D'. Can you explain this answer?
An Almirah is a solid because its
a)
hard and rigid
b)
shape doesn’t change when pressed
c)
density is very high
d)
All of these
|
Jhanvi Mukherjee answered |
An almirah is solid because it is hard and rigid, have fixed shape and have very high density. All these properties are possessed by solid substance only.
The large volumes of gases can be put into small volumes of cylinders because of their property known as compressibility.- a)True
- b)False
Correct answer is 'A'. Can you explain this answer?
The large volumes of gases can be put into small volumes of cylinders because of their property known as compressibility.
a)
True
b)
False
|
Hansa Sharma answered |
The large volumes of gases can be put into small volumes of cylinders because of their property known as compressibility. This is possible because of the large inter particle distance and weak force of attraction between the particles of gas.
The boiling point of water on kelvin scale is –- a)573 K
- b)273 K
- c)373 K
- d)100 K
Correct answer is 'C'. Can you explain this answer?
The boiling point of water on kelvin scale is –
a)
573 K
b)
273 K
c)
373 K
d)
100 K
|
Om Menon answered |
Formula to change the value of celcious into kelvin is K=C+273 As we know that boiling point of water is 100 c. SO, K=100+273 K =373 k.
Gases have highest rate of diffusion among all the three states of matter.- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
Gases have highest rate of diffusion among all the three states of matter.
a)
True
b)
False
|
|
Amit Kumar answered |
Diffusion is the property of matter which is based on the motion of its particles. Diffusion occurs in gases, liquids and solids. Diffusion is fastest in gases and slowest in solids. The rate of diffusion increases on increasing the temperature of the diffusing substance.
Can you explain the answer of this question below:Practice Test/Quiz or MCQ (Multiple Choice Questions) with Solutions of Chapter "Matter in our surroundings" are available for CBSE Class 9 Science and have been compiled as per the syllabus of CBSE Class 9 Science Q. Which of the following has the strongest interparticle force at the room temperature?- A:Nitrogen
- B:Mercury
- C:Iron
- D:Chalk
The answer is C.
Practice Test/Quiz or MCQ (Multiple Choice Questions) with Solutions of Chapter "Matter in our surroundings" are available for CBSE Class 9 Science and have been compiled as per the syllabus of CBSE Class 9 Science
Q. Which of the following has the strongest interparticle force at the room temperature?
A:
Nitrogen
B:
Mercury
C:
Iron
D:
Chalk
|
Sharanya shah answered |
Higher the melting point of a substance, greater will be the force of attraction between particles. The melting point of iron is considerably high, so the force of attraction between its particles is higher.
Convert the temperature of 373°C to the kelvin scale ?- a)646 K
- b)546 K
- c)300 K
- d)500 K
Correct answer is option 'A'. Can you explain this answer?
Convert the temperature of 373°C to the kelvin scale ?
a)
646 K
b)
546 K
c)
300 K
d)
500 K
|
Nikhil Mehra answered |
We know that ,K = °C + 273.15
= 373 deg C + 273.15 deg C
= 646.15 deg C
Name one common substance which can undergo a change in state upon heating or cooling.- a)Salt
- b)Water
- c)Sugar
- d)All of these
Correct answer is option 'B'. Can you explain this answer?
Name one common substance which can undergo a change in state upon heating or cooling.
a)
Salt
b)
Water
c)
Sugar
d)
All of these
|
|
Hansa Sharma answered |
Water can undergo a change in state upon heating and cooling. On heating above 1000C water change into gaseous state and on cooling below 00C it changes into solid state.
Water has boiling point equal to 100°C.- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
Water has boiling point equal to 100°C.
a)
True
b)
False
|
Zzz answered |
It is true as boiling point of water is 100 degree Celsius, the statement is absolutely true and correct
Camphor changes to gaseous state without changing into liquid.- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
Camphor changes to gaseous state without changing into liquid.
a)
True
b)
False
|
|
Jithin Das answered |
It's true because camphor is sublime and it changes directly into gas without passing through the state of liquid. The process in which solid directly changes into gas without passing through the state of liquid is called sublimation.
Graph for Boyle's law is called- a)isotherm
- b)hypertherm
- c)hypotherm
- d)none
Correct answer is option 'A'. Can you explain this answer?
Graph for Boyle's law is called
a)
isotherm
b)
hypertherm
c)
hypotherm
d)
none
|
Rohan Singh answered |
Boyle's law: Graph between P and V at constant temperature is called isotherm and is an equilateral (or rectangular) hyperbola. By plotting P versus 1/V, this hyperbola can be converted to a straight line.
A coffee filter is used to separate coffee liquid from ground, this is a suitable example for- a)sublimation
- b)distillation
- c)filtration
- d)evaporation
Correct answer is option 'C'. Can you explain this answer?
A coffee filter is used to separate coffee liquid from ground, this is a suitable example for
a)
sublimation
b)
distillation
c)
filtration
d)
evaporation
|
|
Hansa Sharma answered |
Filtration is any of various mechanical, physical or biological operations that separate solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass. The fluid that passes through is called the filtrate
Which of the following is not a compound?- a)marble
- b)washing soda
- c)quick lime
- d)brass
Correct answer is option 'D'. Can you explain this answer?
Which of the following is not a compound?
a)
marble
b)
washing soda
c)
quick lime
d)
brass
|
Yuvraj Singhaniya answered |
Compound is the combination of two or more elements chemically but brass is a mixture of two elements
A shining thick liquid is often used in glass thermometers. Name it.- a)Bromine
- b)Mercury
- c)Gallium
- d)Calcium
Correct answer is option 'B'. Can you explain this answer?
A shining thick liquid is often used in glass thermometers. Name it.
a)
Bromine
b)
Mercury
c)
Gallium
d)
Calcium
|
Ananya jain answered |
Mercury is a thick shining liquid used commonly in glass thermometer. It does not stick with wall and expands uniformly on heating.
The process of change of a liquid into vapour at any temperature is called –- a)Diffusion
- b)Evaporation
- c)Cooling
- d)Heating
Correct answer is option 'B'. Can you explain this answer?
The process of change of a liquid into vapour at any temperature is called –
a)
Diffusion
b)
Evaporation
c)
Cooling
d)
Heating
|
|
Ravi Verma answered |
The process of conversion of a substance from the liquid state to its vapor state at any temperature below boiling point is called evaporation or vaporization.
Which of the following is not a mixture? a) Soap solutionb) Bloodc) Carbon dioxided) CoalCorrect answer is option 'C'. Can you explain this answer?
|
Gaurav Kumar answered |
Carbon dioxide is not a mixture since it contain fixed ratio of oxygen and carbon in 2:1, which is a property of compound not a mixture.
Which of the following is not a pure substance?- a)Mercury
- b)Distilled water
- c)Nitric acid
- d)Tap water
Correct answer is 'D'. Can you explain this answer?
Which of the following is not a pure substance?
a)
Mercury
b)
Distilled water
c)
Nitric acid
d)
Tap water
|
|
Varun Kumar answered |
Tap water is not a pure substance because it is mixed with chemicals that purify it and if it was from the ground it has naturally occurring minerals mixed in it.
The evaporation of a liquid occur only at- a)temperature more than 1000C
- b)temperature less than 1000C
- c)fixed temperature
- d)all temperatures
Correct answer is option 'D'. Can you explain this answer?
The evaporation of a liquid occur only at
a)
temperature more than 1000C
b)
temperature less than 1000C
c)
fixed temperature
d)
all temperatures
|
|
Ananya Sharma answered |
Evaporation is the process of conversion of liquid into gas below its boiling point.
Evaporation can occur at any temperature. Where as Boiling occurs at a specific temperature called as Boiling point.
Examples which can prove that evaporation can occur at any temperature:
1. Evaporation of water from water bodies.
2. Evaporation of water from wet clothes.
3. Evaporation of acetone when exposed to open air.
Temperature is one of the factor which effects the rate of EVAPORATION.
If temperature is more rate of EVAPORATION will be more.
Can you explain the answer of this question below:Evaporation causes heating
- A:
True
- B:
False
The answer is B.
Evaporation causes heating
True
False
|
|
Arjun Sharma answered |
When evaporation occurs then than the liquid (mostly water) absorbs all the heat from the surroundings and take it with it and we feel cool. evaporation causes cooling effect because the heat energy is abosorbed by surrounding particles.
Can you explain the answer of this question below:Pressure on the surface of a gas is increased. What will happen to the inter-particle forces?
- A:
They will remain constant
- B:
They will increase
- C:
They will decreases
- D:
None of these
The answer is b.
Pressure on the surface of a gas is increased. What will happen to the inter-particle forces?
They will remain constant
They will increase
They will decreases
None of these
|
|
Anita Menon answered |
Increase in the pressure on the surface of a gas decreases the volume of the gas with increasing its density. The particles start moving in straight lines and also collide with the wall of the container and this collision enhances the inter particle forces and increases the fluidization behaviour.
A desert is ...................- a)an endless stretch of sand
- b)without rainfall
- c)without vegetation
- d)all of the above
Correct answer is option 'D'. Can you explain this answer?
A desert is ...................
a)
an endless stretch of sand
b)
without rainfall
c)
without vegetation
d)
all of the above
|
Parth Nambiar answered |
Desert
Desert is a geographical region that is characterized by extreme dryness and lack of precipitation. It is a vast expanse of land that receives very little rainfall, and as a result, vegetation is scarce, and sand is abundant.
Endless stretch of sand
Deserts are often associated with endless stretches of sand dunes, but this is not always the case. While sand dunes are a common feature of many deserts, there are also rocky deserts, and deserts that are characterized by vast plains of gravel and dirt.
Without rainfall
Deserts are defined by their lack of rainfall, with many receiving less than 10 inches of rain per year. This lack of rainfall is often due to their location, such as being situated in areas that are far from oceans or other moisture sources.
Without vegetation
The extreme dryness of deserts means that vegetation is scarce, with many deserts being home to only a few types of plants that are adapted to the harsh desert environment. These plants often have specialized adaptations to help them survive in the arid conditions, such as the ability to store water in their leaves or roots.
All of the above
In conclusion, deserts are characterized by their lack of rainfall, scarcity of vegetation, and often vast stretches of sand or rocky terrain. These features make deserts some of the most inhospitable places on Earth, but they are also home to a variety of unique and fascinating plant and animal species that have adapted to the harsh desert environment.
Desert is a geographical region that is characterized by extreme dryness and lack of precipitation. It is a vast expanse of land that receives very little rainfall, and as a result, vegetation is scarce, and sand is abundant.
Endless stretch of sand
Deserts are often associated with endless stretches of sand dunes, but this is not always the case. While sand dunes are a common feature of many deserts, there are also rocky deserts, and deserts that are characterized by vast plains of gravel and dirt.
Without rainfall
Deserts are defined by their lack of rainfall, with many receiving less than 10 inches of rain per year. This lack of rainfall is often due to their location, such as being situated in areas that are far from oceans or other moisture sources.
Without vegetation
The extreme dryness of deserts means that vegetation is scarce, with many deserts being home to only a few types of plants that are adapted to the harsh desert environment. These plants often have specialized adaptations to help them survive in the arid conditions, such as the ability to store water in their leaves or roots.
All of the above
In conclusion, deserts are characterized by their lack of rainfall, scarcity of vegetation, and often vast stretches of sand or rocky terrain. These features make deserts some of the most inhospitable places on Earth, but they are also home to a variety of unique and fascinating plant and animal species that have adapted to the harsh desert environment.
Name the process by which a drop of ink spreads in a beaker of water –
- a)Diffusion
- b)Vaporization
- c)Condensation
- d)Sublimation
Correct answer is option 'A'. Can you explain this answer?
Name the process by which a drop of ink spreads in a beaker of water –
a)
Diffusion
b)
Vaporization
c)
Condensation
d)
Sublimation
|
Hridoy Verma answered |
The process by which a drop of ink spreads in a beaker of water is called diffusion.
The separation of two immiscible liquids by a separating funnel depends upon:- a)The difference in their densities.
- b)The difference in their colours.
- c)The difference in their melting points.
- d)The difference in their boiling points
Correct answer is option 'A'. Can you explain this answer?
The separation of two immiscible liquids by a separating funnel depends upon:
a)
The difference in their densities.
b)
The difference in their colours.
c)
The difference in their melting points.
d)
The difference in their boiling points
|
Vikas Kapoor answered |
Separation by a separating funnel :
A mixture of two immiscible liquids can be separated by using a separating funnel. A separating funnel is a special type of funnel which has a stop-cock in its stem to allow the flow of a liquid from it, or to stop the flow of liquid from it. The separation of two immiscible liquids by a separating funnel depends on the difference in their densities.
A mixture of two immiscible liquids can be separated by using a separating funnel. A separating funnel is a special type of funnel which has a stop-cock in its stem to allow the flow of a liquid from it, or to stop the flow of liquid from it. The separation of two immiscible liquids by a separating funnel depends on the difference in their densities.
The temperature at which liquid starts boiling at atmospheric pressure known as –- a)Melting point
- b)Boiling point
- c)Latent heat
- d)Condensation
Correct answer is option 'B'. Can you explain this answer?
The temperature at which liquid starts boiling at atmospheric pressure known as –
a)
Melting point
b)
Boiling point
c)
Latent heat
d)
Condensation
|
|
Sarita Reddy answered |
Boiling occurs when the vapor pressure reaches or exceeds the surrounding pressure from the atmosphere or whatever else is in contact with the liquid. At standard atmospheric pressure (1 atmosphere = 0.101325 MPa), water boils at approximately 100 degrees Celsius.
What type of mixture is obtained on continuous stirring when we add one spoon of sugar to water?- a)Homogeneous mixture
- b)Colloid
- c)Suspension
- d)Heterogeneous mixture
Correct answer is option 'A'. Can you explain this answer?
What type of mixture is obtained on continuous stirring when we add one spoon of sugar to water?
a)
Homogeneous mixture
b)
Colloid
c)
Suspension
d)
Heterogeneous mixture
|
|
Anita Menon answered |
The homogeneous mixture is obtained because the particles of sugar are so small that it can be diffused to the intermolecular space. The composition remains is the same throughout.
What is the basic principle behind simple distillation process?- a)Sufficient difference in the boiling points of two miscible liquids and the two liquids should boil without decomposition.
- b)The two liquids should be immiscible.
- c)Difference in boiling and melting points of two miscible liquids should be less than 30°C.
- d)The two liquids should have molecular weight greater than 200 g/mol.
Correct answer is option 'A'. Can you explain this answer?
What is the basic principle behind simple distillation process?
a)
Sufficient difference in the boiling points of two miscible liquids and the two liquids should boil without decomposition.
b)
The two liquids should be immiscible.
c)
Difference in boiling and melting points of two miscible liquids should be less than 30°C.
d)
The two liquids should have molecular weight greater than 200 g/mol.
|
|
Hansa Sharma answered |
Fractional distillation is the method used for the separation of components of a mixture containing two miscible liquids that boil without decomposition and have sufficient difference in their boiling points.
Two conditions essential for using this method are:
1) Two liquids must be miscible that is they totally mix with each other.
2) The difference between the boiling points of the liquids should be greater than 25K.
Fluids are –- a)Liquids and gases
- b)Solids and gases
- c)Liquids and solids
- d)Only solids
Correct answer is option 'A'. Can you explain this answer?
Fluids are –
a)
Liquids and gases
b)
Solids and gases
c)
Liquids and solids
d)
Only solids
|
|
Arvind Singh answered |
In physics, a fluid is a substance that continually deforms under an applied shear stress. Fluids are a subset of the phases of matter and include liquids, gases, plasmas, and to some extent, plastic solids.
Which of the following is a liquid metal-- a)Copper
- b)Mercury
- c)Bromine
- d)Silver
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a liquid metal-
a)
Copper
b)
Mercury
c)
Bromine
d)
Silver
|
|
Jyoti Kapoor answered |
Mercury
Liquid metal consists of alloys with very low melting points which form a eutectic that is liquid at room temperature. The standard metal used to be mercury, but gallium-based alloys, which are lower both in their vapor pressure at room temperature and toxicity, are being used as a replacement in various applications.
The melting points of two solids [A] and [B] are 300K and 350K respectively. Which has more inter-particles forces?- a)[A]
- b)both have same inter-particles forces
- c)Information not enough.
- d)[B]
Correct answer is option 'D'. Can you explain this answer?
The melting points of two solids [A] and [B] are 300K and 350K respectively. Which has more inter-particles forces?
a)
[A]
b)
both have same inter-particles forces
c)
Information not enough.
d)
[B]
|
|
Ananya Das answered |
With increase in temperature, inter-particles forces decreases. As the melting point of solid A is less than Solid B. Solid B has more inter-particle forces of attraction. Higher the melting point more the inter-particle force.
Which of the following solids undergo sublimation upon heating?- a)Ice
- b)Urea
- c)sugar
- d)Iodine
Correct answer is option 'D'. Can you explain this answer?
Which of the following solids undergo sublimation upon heating?
a)
Ice
b)
Urea
c)
sugar
d)
Iodine
|
|
Hansa Sharma answered |
The process of changing solid directly into gases without changing into liquid is called sublimation. In the substance given above only Iodine is a sublime substance.
Match the following with correct response.
(1) Dry ice
(2) Humidity
(3) Temperature
(4) Liquefied gas
(A) Reduce evaporation
(B) Increasing pressure reducing temperature
(C) Increases evaporation
(D) Solid carbon-dioxide- a)1-B, 2-D, 3-A, 4-C
- b)1-C, 2-B, 3-D, 4-A
- c)1-D, 2-A, 3-C, 4-B
- d)1-A, 2-C, 3-B, 4-D
Correct answer is option 'C'. Can you explain this answer?
Match the following with correct response.
(1) Dry ice
(2) Humidity
(3) Temperature
(4) Liquefied gas
(A) Reduce evaporation
(B) Increasing pressure reducing temperature
(C) Increases evaporation
(D) Solid carbon-dioxide
(1) Dry ice
(2) Humidity
(3) Temperature
(4) Liquefied gas
(A) Reduce evaporation
(B) Increasing pressure reducing temperature
(C) Increases evaporation
(D) Solid carbon-dioxide
a)
1-B, 2-D, 3-A, 4-C
b)
1-C, 2-B, 3-D, 4-A
c)
1-D, 2-A, 3-C, 4-B
d)
1-A, 2-C, 3-B, 4-D
|
|
Raghav Bansal answered |
solid carbon dioxide is known as dry ice. The reduced evaporation is called humidity. Evaporation is increased by temperature. The liquefied gas increases pressure and reduces temperature.
Which of the following colloid is a gel?- a)Fog
- b)Cheese
- c)Milk
- d)Smoke
Correct answer is option 'B'. Can you explain this answer?
Which of the following colloid is a gel?
a)
Fog
b)
Cheese
c)
Milk
d)
Smoke
|
|
Vivek Rana answered |
The colloidal system constituting the liquid as the dispersed phase and the solid as the dispersion medium is known as gel. There are some sols that have a high concentration of dispersed solid and change spontaneously into semi solid form on cooling. These are known as gels and the process is known as gelatin
The process for the change of a solid directly into its vapour is called –- a)Evaporation
- b)Ebullition
- c)Condensation
- d)Sublimation
Correct answer is option 'D'. Can you explain this answer?
The process for the change of a solid directly into its vapour is called –
a)
Evaporation
b)
Ebullition
c)
Condensation
d)
Sublimation
|
Sanchita Choudhury answered |
Sublimation is the process through which the solid substance changes directly into vapours or gaseous state without passing through liquid state. Dry ice is a common example of this process.
Convert the temperature of 270 K to the celsius scale –- a)– 3°C
- b)– 4°C
- c)2°C
- d)5°C
Correct answer is option 'A'. Can you explain this answer?
Convert the temperature of 270 K to the celsius scale –
a)
– 3°C
b)
– 4°C
c)
2°C
d)
5°C
|
|
Amit Kumar answered |
We know that °C = K - 273.15
C= K - 273
C= 270 - 273
C = -3
C= 270 - 273
C = -3
Sulphur dioxide is collected in the lab in a gas jar by upward displacement of air. Which of the following statement is correct regarding the density of the gas?- a)No correct statement can be made about the density of the gas.
- b)It is lighter than air
- c)It is heavier than air
- d)Its density is equal to that of air
Correct answer is option 'C'. Can you explain this answer?
Sulphur dioxide is collected in the lab in a gas jar by upward displacement of air. Which of the following statement is correct regarding the density of the gas?
a)
No correct statement can be made about the density of the gas.
b)
It is lighter than air
c)
It is heavier than air
d)
Its density is equal to that of air
|
|
Amit Sharma answered |
At room temperature, sulfur dioxide is a nonflammable, colorless gas that is heavier than air. Its strong, pungent odor and irritating properties usually provide adequate warning of its presence.
Can you explain the answer of this question below:A combination of common salt and iron filings is a- A:Mixture
- B:Elements
- C:Compound
- D:both a and b
The answer is a.
A combination of common salt and iron filings is a
A:
Mixture
B:
Elements
C:
Compound
D:
both a and b
|
Prachi Rathore answered |
Here 2 substances are combined together so it is a mixture
A substance upon heating directly changes into gaseous state. What is this change called?- a)Melting
- b)Fusion
- c)Sublimation
- d)Condensation
Correct answer is option 'C'. Can you explain this answer?
A substance upon heating directly changes into gaseous state. What is this change called?
a)
Melting
b)
Fusion
c)
Sublimation
d)
Condensation
|
|
Neeti Gupta answered |
Sublimation
Sublimation is the process in which a substance directly changes from a solid to a gaseous state without passing through the liquid phase. This change occurs when the substance is heated to a temperature at which its vapor pressure exceeds the atmospheric pressure. Sublimation is an endothermic process, meaning that it requires energy in the form of heat to occur.
Examples of Sublimation:
1. Dry ice - When dry ice, which is solid carbon dioxide, is heated it directly changes into carbon dioxide gas without melting into a liquid.
2. Camphor - When camphor is heated, it directly changes into a gaseous state without melting.
3. Naphthalene balls - Naphthalene balls used for moth control also undergo sublimation on heating.
Uses of Sublimation:
1. Sublimation is used in the purification of substances. For example, when impure solid iodine is heated, it directly changes into iodine vapor, which can be collected and condensed into pure solid iodine.
2. Sublimation is used in the production of certain chemicals, such as in the production of semiconductor materials.
3. Sublimation is also used in the manufacturing of dry ice, which is used in refrigeration and transportation of food and medical products.
Conclusion:
Sublimation is a process in which a substance directly changes from a solid to a gaseous state without passing through the liquid phase. It is an important process with various industrial and scientific applications.
Sublimation is the process in which a substance directly changes from a solid to a gaseous state without passing through the liquid phase. This change occurs when the substance is heated to a temperature at which its vapor pressure exceeds the atmospheric pressure. Sublimation is an endothermic process, meaning that it requires energy in the form of heat to occur.
Examples of Sublimation:
1. Dry ice - When dry ice, which is solid carbon dioxide, is heated it directly changes into carbon dioxide gas without melting into a liquid.
2. Camphor - When camphor is heated, it directly changes into a gaseous state without melting.
3. Naphthalene balls - Naphthalene balls used for moth control also undergo sublimation on heating.
Uses of Sublimation:
1. Sublimation is used in the purification of substances. For example, when impure solid iodine is heated, it directly changes into iodine vapor, which can be collected and condensed into pure solid iodine.
2. Sublimation is used in the production of certain chemicals, such as in the production of semiconductor materials.
3. Sublimation is also used in the manufacturing of dry ice, which is used in refrigeration and transportation of food and medical products.
Conclusion:
Sublimation is a process in which a substance directly changes from a solid to a gaseous state without passing through the liquid phase. It is an important process with various industrial and scientific applications.
When the liquid starts boiling, the further heat energy which is supplied- a)is lost to the surrounding as such
- b)increases the K.E of the particle in the liquid
- c)Increases the temperature of the liquid.
- d)is absorbed as latent heat of vaporization by the liquid
Correct answer is option 'D'. Can you explain this answer?
When the liquid starts boiling, the further heat energy which is supplied
a)
is lost to the surrounding as such
b)
increases the K.E of the particle in the liquid
c)
Increases the temperature of the liquid.
d)
is absorbed as latent heat of vaporization by the liquid
|
Prerna Desai answered |
When the liquid starts boiling, the further heat energy which is supplied is absorbed as latent heat of vaporization by the liquid to change its state of matter.
Plasma is the.......... state of matter –- a)First
- b)Second
- c)Third
- d)Fourth
Correct answer is option 'D'. Can you explain this answer?
Plasma is the.......... state of matter –
a)
First
b)
Second
c)
Third
d)
Fourth
|
|
Ananya Sharma answered |
A plasma is a hot ionized gas consisting of approximately equal numbers of positively charged ions and negatively charged electrons. The characteristics of plasmas are significantly different from those of ordinary neutral gases so that plasmas are considered a distinct "fourth state of matter."
The smell of hydrogen sulphide (H2S) gas- a)pleasant
- b)of rotten egg
- c)of burning sulphur
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
The smell of hydrogen sulphide (H2S) gas
a)
pleasant
b)
of rotten egg
c)
of burning sulphur
d)
None of these
|
Pooja Shah answered |
Hydrogen sulfide is a flammable, colorless gas with a characteristic odour of rotten eggs. It is commonly known as hydrosulfuric acid, sewer gas, and stink damp. People can smell it at low levels.
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