Entropy MCQs with Answers

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Entropy Online Quiz

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• Test Name: Entropy MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Entropy

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1 / 40

What is the symbol for entropy in thermodynamic equations?

H

S

G

2 / 40

Entropy change (ΔS) is positive for __________ reactions.

Non-spontaneous

Equilibrium

Spontaneous

3 / 40

Entropy of a system is a __________ property.

State

Path

Time

4 / 40

Which principle states that the total entropy of an isolated system can never decrease over time?

Third Law of Thermodynamics

First Law of Thermodynamics

Second Law of Thermodynamics

5 / 40

The entropy of a perfect crystal at absolute zero is __________.

Infinite

Zero

One

6 / 40

What is the effect on entropy when a gas expands into a vacuum?

Increases

No change

Decreases

7 / 40

Entropy is measured in units of __________.

Kelvin

Joules per Kelvin

Joules

8 / 40

Which quantity is used to predict the spontaneity of a process?

Gibbs Free Energy

Internal Energy

Enthalpy

9 / 40

A spontaneous reaction has a __________ entropy change.

Negative

Positive

Zero

10 / 40

Which of the following processes is associated with a decrease in entropy?

Freezing

Vaporization

Melting

11 / 40

What is entropy a measure of?

Disorder

Energy

Volume

12 / 40

Which reaction type generally increases the entropy of the system?

Synthesis

Decomposition

Combustion

13 / 40

Which substance would have the lowest entropy at 25°C?

Diamond

Water

Oxygen gas

14 / 40

The concept of entropy was introduced by __________.

James Joule

Rudolf Clausius

Isaac Newton

15 / 40

The entropy of a substance __________ as it changes from gas to liquid.

Increases

Decreases

Stays the same

16 / 40

Which state has the highest entropy?

Gas

Solid

Liquid

17 / 40

Entropy is often referred to as a measure of __________.

Temperature

Energy

Disorder

18 / 40

In a reversible process, the change in entropy is __________.

Zero

Negative

Positive

19 / 40

The Second Law of Thermodynamics implies that natural processes tend to move towards __________.

Order

Disorder

Equilibrium

20 / 40

Entropy change is __________ for an adiabatic process.

Zero

Negative

Positive

21 / 40

In an exothermic reaction, the entropy of the surroundings __________.

Decreases

Remains the same

Increases

22 / 40

Entropy is a measure of __________ in a system.

Disorder

Pressure

Temperature

23 / 40

In an isolated system, entropy tends to __________.

Decrease

Stay constant

Increase

24 / 40

Which phase of matter has the highest entropy?

Gas

Liquid

Solid

25 / 40

Which law of thermodynamics states that entropy of an isolated system never decreases?

Second Law

First Law

Third Law

26 / 40

When ice melts into water, the entropy __________.

Increases

Decreases

Remains the same

27 / 40

What happens to the entropy of the universe in a spontaneous process?

Decreases

Remains the same

Increases

28 / 40

The standard entropy change for the formation of a compound from its elements is known as __________.

Standard Molar Entropy

Gibbs Free Energy

Standard Enthalpy

29 / 40

For a given substance, entropy increases with __________.

Volume

Temperature

Pressure

30 / 40

Entropy increases with the __________ of energy dispersal in a system.

Increase

No change

Decrease

31 / 40

Which scientist is associated with the concept of entropy?

Michael Faraday

Rudolf Clausius

Isaac Newton

32 / 40

Which of the following has the highest molar entropy at standard conditions?

Gas

Liquid

Solid

33 / 40

Entropy is a thermodynamic quantity that represents the unavailability of a system's __________.

Energy

Volume

Work

34 / 40

In which type of reaction is the entropy change typically positive?

Precipitation

Dissolution

Combination

35 / 40

Which factor does NOT affect the entropy of a system?

Volume

Temperature

Color

36 / 40

During which process does entropy remain constant?

Spontaneous

Irreversible

Reversible

37 / 40

What is the term for the measure of the number of possible arrangements of a system?

Enthalpy

Entropy

Energy

38 / 40

Entropy generally increases when a substance changes from __________.

Solid to liquid

Liquid to solid

Gas to liquid

39 / 40

Entropy is associated with the __________ of a system.

Microstates

Macrostates

Equilibrium

40 / 40

Which of the following reactions would result in a decrease in entropy?

2H₂(g) + O₂(g) → 2H₂O(l)

N₂(g) + 3H₂(g) → 2NH₃(g)

H₂O(l) → H₂O(g)

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