Chemistry · Science General

States of Matter

2,382 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

Consider the following statements:

  1. During the conversion of solids into liquids and liquids into gases, the temperature remains constant.
  2. One cc of iron rod is heavier than one cc of chalk. Which of the given statements is/are correct?

  1. Only (1)

  2. Only (2)

  3. Both (1) and (2)

  4. Neither (1) nor (2)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement (1) is correct. The molecules of solids have the maximum force of attraction among them. For the conversion of solid into liquid, the given heat is used to break the strong bonds between them. Statement (2) is also correct. Iron rod is heavier because the space between the particles of iron is very less, comparatively to the space between the particles of chalk.

Multiple choice

Consider the following statements: (1) At cold surface of glass, oxygen and hydrogen in air reacts to form water. (2) Water in the glass comes on the outer surface. (3) Water vapours in air, on contact with cold surface, lose energy and get converted into liquid state.

Which of the statements justify/justifies the condensation of water droplets at the outer surface of glass containing cold water?

  1. Only (1)

  2. Only (3)

  3. Only (1) and (2)

  4. Only (1) and (3)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The correct reason for the condensation of water droplets at the outer surface of glass containing cold water is the loss of KE of water molecules, when come in contact with cold surface.

Multiple choice

Consider the following statements: (1) Out of milk, jam and ammonia gas, ammonia diffuses the fastest in water. (2) Out of milk, jam and ammonia gas, the particles of ammonia have the maximum kinetic energy.

Which of the statements given above is/are true?

  1. Only (1)

  2. Only (2)

  3. Both (1) and (2)

  4. Neither (1) nor (2)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement (i) is correct. Gases have high diffusing capability as compared to solid and liquid forms. Statement (ii) is correct. Gases have high KE due to large intermolecular spaces.

Multiple choice

In which of the following cases does water (liquid) change to ice (solid) form? (1) Increase in pressure (2) Decrease in pressure (3) Increase in surface tension (4) Decrease in surface tension

  1. Only (1)

  2. Only (2)

  3. Only (1) and (3)

  4. Only (1) and (4)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

(a) With the increase in pressure, the water molecules come closer to each other and solidify. (b) With increase in surface tension of water, it leads to freezing by compressing the molecules of water.

Multiple choice

Match the followings ||| |---|---| |1. Sugar|A. Floats on the water| |2. Sand |B. Sinks in the water| |3. Ice |C. Not soluble in water| |4. Stone |D. Dissolves in water|

  1. 1 - B, 2 - A, 3 - C, 4 - D

  2. 1 - D, 2 - C, 3 - A, 4 - B

  3. 1 - C, 2 - A, 3 - D, 4 - B

  4. 1 - A, 2 - B, 3 - C, 4 - D

  5. 1 - D, 2 - C, 3 - B, 4 - A
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option as Sugar is dissovlves in the water, Sand is not soluble in water, Ice floats on the water and Stone sinks in water. 

Multiple choice

Ramesh filled his water bottle with hot water and closed its cap tightly. His bottle got distorted when he washed it with cold water. Which of the following is the correct reason behind this?

  1. Pressure inside bottle is lower than outer pressure

  2. Pressure inside bottle is greater than outer pressure

  3. Pressure inside bottle is equal to outer pressure

  4. There is no air inside

  5. The hot water inside the bottle melts and distorts the bottle walls.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, it is correct. When boiled water is filled in the water bottle and its mouth is closed,  followed by cold water being poured over it, the bottle gets distorted. This happens because air inside the can gets condensed and creates low pressure. The high pressure from outside distorts the shape of the bottle.

Multiple choice

What is chemiclave?

  1. Chemical vapour sterilization

  2. Submerging the instruments for 4 hours in chemicals

  3. Boiling for 2 hours in water and then submerging for 2 hours in chemicals

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chemiclave is a machine which sterilizes instruments with high pressure, high temperature water and some chemicals like alcohol and formaldehyde vapour. It is therefore a sterilization unit that uses chemicals under pressure.

Multiple choice

What happens when water freezes?

  1. Its size increases.

  2. Its size decreases.

  3. Its weight increases.

  4. Its weight decreases.

  5. Its size remains the same as it was before freezing.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When water freezes, its size (volume) increases. This is one of the reasons for the bursting of water pipeline in winter because when water freezes, it converts into ice and increases in size. Water is one of the few substances that expand on cooling.

Multiple choice

Which of the following statements is correct?

  1. All living things do not need water.

  2. All non-living things need water.

  3. We cannot survive without water.

  4. Water is not important on earth.

  5. Ice and snow are liquid forms of water.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

We cannot survive without water because water is very important component of our life. Living things need water to grow and survive. They cannot survive without water for very long. All kind of processes, like growth, metabolism of food depend on water.