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 chemistry materials liquid crystals liquid state the liquid state

How many of the following properties are shown by liquid  state?
Rigidity, Definite volume. No free surface, Define shape

  1. $1$
  2. $2$
  3. $3$
  4. $4$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The properties of liquids are as follows:

  • It does not have a fixed shape but it has a fixed volume.
  • It does not have definite shape.
  • It has a free surface.
  • It does not show rigidity.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

The temperature remains constant during melting and all the ice changes into water. The enthalpy change associated with this process is due to _____________.

  1. latent heat of fusion

  2. latent heat of vaporisation

  3. latent heat of evaporation

  4. latent heat of sublimation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Latent heat is the energy released or absorbed by a body during a constant temperature process. An example is a phase transition such as ice melting or water boiling. Heat absorbed during melting is called latent heat fusion.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

Can water be made to boil in a paper cup without the paper being burnt. This is because ___________.

  1. temperature of water does not change during boiling.

  2. ignition temperature of paper is higher than the boiling point of water

  3. high latent heat of vaporization of water

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The paper cup in which water is placed is having ignition temperature higher than the  boiling point of water, and water have high latent heat of vaporization. This is also possible that temperature provided to water does not exceed its boiling point. Hence, water can boil in paper cup without burning the cup.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

Why does temperature remain constant as a liquid is heated and gets converted to its gaseous state at its boiling point? 

  1. Due to increase in potential energy

  2. Due to increase in kinetic energy

  3. Due to decrease in potential energy

  4. Due to decrease in kinetic energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As a liquid is heated at constant pressure, its temperature increases. This trend continues until the boiling point of the liquid is reached. No further rise in temperature of the liquid can be induced by heating due to increase in kinetic energy.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

Which one of the following is a correct statement?
1. Ice provides more cooling effect than water at $273\ K$.
2. Evaporation of a liquid causes cooling.
3. Increase of pressure lowers the separation between the particles of matter.

  1. $1$ and $2$
  2. $1$ and $3$
  3. $2$ and $3$
  4. $1, 2$ and $3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ice provides more cooling effect than water at 273 K because of latent heat of fusion. Evaporation of a liquid causes cooling as the surface molecules take away heat to escape out. Increase of pressure lowers the separation between the particles of matter and brings them closer leading to change of state from gas to liquid and to solid.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

What is the shape of the meniscus observed when water and mercury are taken in two different capillary tubes?

  1. Concave and convex

  2. Convex and concave

  3. Both concave

  4. Both conves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The shape of the meniscus observed when water and mercury are taken in two different capillary tubes is concave and convex respectively.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

The amount of energy required to change $1\ kg$ of a solid into liquid at atmospheric pressure at its melting point is known as _______________.

  1. latent heat of fusion

  2. latent heat of boiling

  3. latent heat of freezing

  4. melting energy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The amount of energy required to change $1\ kg$ of a solid into liquid at atmospheric pressure at its melting point is known as latent heat of fusion.

Hence option A is correct.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

An experiment is conducted where droplets of liquid are placed on the surface of a penny. Which of the following substances would you expect to the able to place the maximum number of drops of on the surface of the penny?

  1. $HF$
  2. $H _{2}O$
  3. $CH _{3}CH _{2}CHO$
  4. $CCl _{4}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fluorine is most electronegative element so it forms stronger hydrogen bond which is the reason of stronger surface tension.So HF drops place maximum on the penny.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

What happens to the rate of evaporation of water, if the atmospheric pressure is decreased during the extraction of colored components?

  1. Increases

  2. Decreases

  3. Do not change

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

The rate of evaporation of water increases, if the atmospheric pressure is decreased during the extraction of colored components because atmospheric pressure is inversely proportional to evaporation. 

Multiple choice chemistry materials liquid crystals liquid state the liquid state

What happens to the rate of evaporation of water, if the atmospheric pressure is increased during the extraction of the colored component from liquid? 

  1. Increases

  2. Decreases

  3. Do not change

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Evaporation is a surface phenomenon in which surface molecules of solution moves to the atmosphere.If atmospheric pressure is increased then due to external pressure molecules on the surface will not move to the atmosphere so if atmospheric pressure increases, a rate of evaporation decreases.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

Metallic liquids contain:

  1. metal atoms

  2. ions and mobile electrons

  3. aggregates of metal atom

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When metals are in liquids, they dissociate into ions and give away electrons. So, metallic liquids contain ions and mobile electrons.

Ex: $Na _{(s)}\longrightarrow Na^+ _{(ag)}+e^-$
Ex: $Mg _{(s)}\longrightarrow Mg^{+2} _{(ag)}+2e^-$

Multiple choice chemistry materials liquid crystals liquid state the liquid state

When a solid crystal is melted, it should become a liquid. Liquid crystals are an intermediate stage between a liquid and a crystal. Which of the following is a liquid crystal of a non-living system?

  1. Cholesteryl bromide

  2. Axons of nerve

  3. Striated muscle fibre

  4. Cilia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Axons of nerve, striated muscle fibre, cilia all belong to bio-logical living systems.

Cholesteryl bromide $(C _{27}H _{45}Br)$ is a liquid crystal of a non-living system.