Chemistry ยท 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

What is the name of the state of matter in which a substance has a definite volume but no definite shape?

  1. Solid

  2. Liquid

  3. Gas

  4. Plasma
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A liquid is a state of matter in which a substance has a definite volume but no definite shape. The particles in a liquid are held together by weaker intermolecular forces than in a solid.

Multiple choice

What is the name of the state of matter in which a substance has no definite shape or volume?

  1. Solid

  2. Liquid

  3. Gas

  4. Plasma
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A gas is a state of matter in which a substance has no definite shape or volume. The particles in a gas are very far apart and have very weak intermolecular forces.

Multiple choice

What is the chemical formula for water?

  1. H2O

  2. CO2

  3. NaCl

  4. CH4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water is composed of two hydrogen atoms and one oxygen atom, giving it the chemical formula H2O.

Multiple choice

What is the process by which water vapor in the air condenses into liquid water?

  1. Evaporation

  2. Condensation

  3. Sublimation

  4. Deposition
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Condensation is the process by which water vapor in the air condenses into liquid water. It occurs when the air temperature drops below the dew point, causing the water vapor to condense into tiny water droplets, forming clouds or fog.

Multiple choice

What is the term for the temperature at which a liquid turns into a gas?

  1. Freezing point

  2. Boiling point

  3. Melting point

  4. Condensation point
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The boiling point is the temperature at which a liquid turns into a gas. It is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid.

Multiple choice

What is the term for the temperature at which a gas turns into a liquid?

  1. Freezing point

  2. Boiling point

  3. Melting point

  4. Condensation point
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The condensation point is the temperature at which a gas turns into a liquid. It is the temperature at which the vapor pressure of the gas equals the pressure surrounding the gas.

Multiple choice

What is the term for the process by which a solid turns into a gas without first becoming a liquid?

  1. Evaporation

  2. Condensation

  3. Sublimation

  4. Deposition
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sublimation is the process by which a solid turns into a gas without first becoming a liquid. It occurs when the solid's molecules gain enough energy to break free from the intermolecular forces holding them in place.

Multiple choice

What is the term for the process by which a gas turns into a solid without first becoming a liquid?

  1. Evaporation

  2. Condensation

  3. Sublimation

  4. Deposition
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Deposition is the process by which a gas turns into a solid without first becoming a liquid. It occurs when the gas molecules lose enough energy to condense into a solid state.

Multiple choice

What is the term for the process by which water vapor in the air changes directly into ice crystals?

  1. Evaporation

  2. Condensation

  3. Sublimation

  4. Deposition
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Deposition is the process by which water vapor in the air changes directly into ice crystals without first becoming a liquid. It occurs when the water vapor molecules lose enough energy to condense directly into a solid state.

Multiple choice

What is the term for the process by which ice crystals in the air melt and turn into liquid water?

  1. Evaporation

  2. Condensation

  3. Sublimation

  4. Melting
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Melting is the process by which ice crystals in the air melt and turn into liquid water. It occurs when the ice crystals absorb enough energy to break the intermolecular bonds holding them in a solid state.

Multiple choice

What is the term for the process by which liquid water in the air freezes and turns into ice crystals?

  1. Evaporation

  2. Condensation

  3. Sublimation

  4. Freezing
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Freezing is the process by which liquid water in the air freezes and turns into ice crystals. It occurs when the liquid water molecules lose enough energy to form intermolecular bonds and transition into a solid state.

Multiple choice

What is the term for the process by which water vapor in the air changes directly into liquid water without first becoming a solid?

  1. Evaporation

  2. Condensation

  3. Sublimation

  4. Deposition
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Condensation is the process by which water vapor in the air changes directly into liquid water without first becoming a solid. It occurs when the water vapor molecules lose enough energy to condense into a liquid state.

Multiple choice

What is the term for the process by which liquid water in the air evaporates and turns into water vapor?

  1. Evaporation

  2. Condensation

  3. Sublimation

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

Evaporation is the process by which liquid water in the air evaporates and turns into water vapor. It occurs when the liquid water molecules gain enough energy to break free from the intermolecular forces holding them in a liquid state.

Multiple choice

What is the name of the phase transition that occurs when a material changes from a liquid to a solid?

  1. Melting

  2. Freezing

  3. Sublimation

  4. Deposition
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Freezing is the phase transition that occurs when a material changes from a liquid to a solid. During freezing, the molecules of the liquid lose energy and slow down, causing them to arrange themselves in a more ordered, crystalline structure.

Multiple choice

Which of the following is an example of a thermodynamically unstable system?

  1. A mixture of hydrogen and oxygen gases at room temperature

  2. A diamond at room temperature

  3. A glass of water at room temperature

  4. A cup of hot coffee at room temperature
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A cup of hot coffee is a thermodynamically unstable system because it has a high free energy and is prone to change, such as cooling down to room temperature.