Chemistry · Science General

States of Matter

2,682 Questions

States of matter questions explore physical changes, evaporation, phase transitions, and the properties of liquids and gases. Topics cover density, cryosurgery, heavy water, and electrolytes. This foundational chemistry topic frequently appears in general science sections of SSC and railway exams.

Phase change mechanismsEvaporation and temperature effectsProperties of liquidsPhysical versus chemical changesElectrolytes and heavy water

States of Matter Questions

Multiple choice

Which of the following statements is true about the effect of temperature on the state of matter?

  1. Increase in temperature increases the potential energy of particles in solids and liquids.

  2. Increase in temperature increases the kinetic energy of the particles in solids and liquids.

  3. Energy provided by heat increases the forces of attraction among the particles of solids and liquids.

  4. With an increase in temperature, the particles arrange themselves in the form of solids and liquids.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

With an increase in temperature, the forces of attraction between particles become weak and they start vibrating and finally, change into another form of matter.

Multiple choice

Why does the temperature remain constant during the melting of ice, although heat is continuously supplied?

  1. Because heat is used up in breaking the bonds between the particles

  2. Because heat is lost in the atmosphere

  3. Because heat is used up in maintaining equilibrium in the system and surroundings

  4. Because heat is absorbed by the container
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During the melting of ice, the temperature of the system remains constant at 0o C,till all the ice melts, eventhough heat is continuously supplied. This is because the heat supplied is used up in changing the state by overcoming the forces of attraction between the particles. As this heat energy is absorbed by the ice without showing any rise in temperature, it is called latent heat of fusion. 

Multiple choice

Coconut is an excellent example of a water dispensed fruit. Which of the following characteristics of coconut fruit help it to survive a long journey on water? (1) The coconut fruit is big and light. (2) The coconut fruit has a waterproof skin. (3) The coconut fruit has a fibrous husk with numerous air spaces.

  1. 1 only

  2. 3 only

  3. 1 and 3 only

  4. 2 and 3 only

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The coconut fruit has a waterproof skin and it contains fibrous husk with numerous air spaces. This helps it to survive a long journey on water.

Multiple choice

Which is incorrect about primary standard?

  1. They are hygroscopic and deliquescent

  2. They are stable in air.

  3. They exist in highly pure state.

  4. They readily dissolve in water.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct as we know that primary standards are neither hygroscopic nor deliquescent. This can be explained as follows: these are the reagents whose weight is true representative of the number of moles of the substance contained so if they would have been hygroscopic or deliquescent then they will undergo some change in their properties and will not represent the true no. of moles of the substance contained and hence these substances cannot be deliquescent of hygroscopic. Hence, this option is correct.

Multiple choice

Which of the following is a wrong option?

  1. When we heat solid, it converts into liquid.

  2. When we cool solid, it converts into gas.

  3. When we cool liquid, it converts into solid.

  4. When we heat liquid, it converts into gas.

  5. When we condense gas, it converts into liquid.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is a wrong statement. When we cool solid, it will remain solid and will not change its state of matter.

Multiple choice

Mrs. Sharma was making sweets. She had to dissolve two big pieces of jaggery in a cup of water. How can she do this quickly?

  1. By dissolving it in cold water

  2. By dissolving it in hot water

  3. By dissolving it in ice

  4. By freezing the jaggery

  5. Jaggery cannot be dissolved fast.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If we dissolve jaggery in hot water, it will dissolve fast as it breaks the bonds between the jaggery particles easily and so it  dissolves quickly.

Multiple choice

Manisha was helping her mother in kitchen, where she saw water was boiling in a pan and vapours were coming out of the pan. She put a plate on the pan to stop the vapours which were coming out of the pan. What changes will she observe in water after putting the plate on the pan for some time?

  1. Water will stop boiling.

  2. The amount of water will increase in the pan.

  3. The amount of water will decrease in the pan.

  4. The amount of water will remain unchanged.

  5. Vapours still come out of the pan.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The amount of water will remain unchanged as she has stopped the process of evaporation. The vapours which were coming out from pan earlier, now get no space to come out. So the amount of water will remain unchanged.

Multiple choice

A student took two dishes. Dish A is covered and Dish B is open. He poured equal amount of water in these dishes and put them in an open area. In which dish will the water evaporate fast?

  1. Dish A

  2. Dish B

  3. Same in both dishes

  4. Water will not evaporate until heated on gas.

  5. Cannot be determined
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Since Dish B is open, so the water will evaporate more faster. The mouth of Dish B is wide open which creates lot of space for water vapours to come out.