Chemistry ยท 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 is NOT a state of matter?

  1. Solid

  2. Liquid

  3. Gas

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

Plasma is considered a state of matter, not a fundamental state like solid, liquid, and gas.

Multiple choice

What is the Lindemann criterion for melting?

  1. The Lindemann criterion for melting states that a solid will melt when the root mean square displacement of its atoms reaches a critical value.

  2. The Lindemann criterion for melting states that a solid will melt when the average kinetic energy of its atoms reaches a critical value.

  3. The Lindemann criterion for melting states that a solid will melt when the potential energy of its atoms reaches a critical value.

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

The Lindemann criterion for melting states that a solid will melt when the root mean square displacement of its atoms reaches a critical value. This criterion is based on the idea that melting occurs when the atoms in a solid become too mobile to maintain their ordered structure.

Multiple choice

What is a phase transition?

  1. A change in the physical properties of a substance at a specific temperature or pressure

  2. A change in the chemical composition of a substance

  3. A change in the state of matter (e.g., solid to liquid)

  4. A change in the energy of a system
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A phase transition is a change in the physical properties of a substance at a specific temperature or pressure, such as melting, freezing, or boiling.

Multiple choice

What is the critical point in a phase diagram?

  1. The point where two phases coexist in equilibrium

  2. The point where a phase transition occurs

  3. The point where the entropy of a system is maximum

  4. The point where the pressure of a system is minimum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The critical point is the point in a phase diagram where two phases coexist in equilibrium, and it represents the boundary between different phases.

Multiple choice

The process by which water changes from a solid to a gas without passing through the liquid phase is called:

  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 water changes from a solid to a gas without passing through the liquid phase.

Multiple choice

What is the term used to describe the positive feedback loop that occurs when melting ice and snow exposes more dark surfaces, which absorb more heat and cause further melting?

  1. Albedo effect

  2. Greenhouse effect

  3. Feedback loop

  4. Positive feedback loop
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A positive feedback loop is a process that amplifies itself. In the case of global warming, the melting of ice and snow exposes more dark surfaces, which absorb more heat and cause further melting.

Multiple choice

The phase transition from a solid to a liquid is characterized by:

  1. An increase in entropy

  2. A decrease in entropy

  3. No change in entropy

  4. A change in temperature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The phase transition from a solid to a liquid is characterized by an increase in entropy, as the molecules gain more freedom of movement.

Multiple choice

According to Thales, the primary substance from which all things originated was:

  1. Water

  2. Air

  3. Fire

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

Thales believed that water was the fundamental substance from which all things arose and to which they eventually returned.

Multiple choice

What is the term used to describe the process of ice melting due to rising temperatures?

  1. Sublimation

  2. Ablation

  3. Evaporation

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

Ablation is the term used to describe the process of ice melting due to rising temperatures. It can occur through various mechanisms, including surface melting, calving, and sublimation.

Multiple choice

What is the term used to describe the process of ice crystals forming directly from water vapor without passing through the liquid phase?

  1. Sublimation

  2. Ablation

  3. Evaporation

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

Sublimation is the term used to describe the process of ice crystals forming directly from water vapor without passing through the liquid phase. It is a common process in cold, dry environments.

Multiple choice

What is the term used to describe the process of water vapor turning into liquid water?

  1. Sublimation

  2. Ablation

  3. Evaporation

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

Condensation is the term used to describe the process of water vapor turning into liquid water. It occurs when water vapor comes into contact with a cooler surface.

Multiple choice

What is the term used to describe the process of ice melting and forming new ice in different locations?

  1. Sublimation

  2. Ablation

  3. Evaporation

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

Sublimation is the term used to describe the process of ice melting and forming new ice in different locations. It involves the direct transition of ice from a solid to a gas and vice versa.

Multiple choice

What is the term used to describe the process of water vapor turning into ice crystals?

  1. Sublimation

  2. Ablation

  3. Evaporation

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

Condensation is the term used to describe the process of water vapor turning into ice crystals. It occurs when water vapor comes into contact with a colder surface.

Multiple choice

What is the term used to describe the process of ice melting and forming new ice in the same location?

  1. Sublimation

  2. Ablation

  3. Evaporation

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

Ablation is the term used to describe the process of ice melting and forming new ice in the same location. It involves the melting of ice at the surface and the formation of new ice at the bottom.

Multiple choice

What is the term used to describe the process of ice formation from water vapor in the atmosphere?

  1. Condensation

  2. Sublimation

  3. Deposition

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

Deposition is the process by which water vapor in the atmosphere directly transforms into ice crystals without passing through the liquid phase.