Thermodynamics for Chemical

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1.Which of the following statements is accurate?

The absolute standard entropy of elemental substances is zero, similar to internal energy and enthalpy.When ice melts, enthalpy rises while the disorder decreases.The internal energy of an ideal gas is solely a function of its pressure.The greatest amount of work is achieved during reversible processes.

2.Given that Gibbs free energy (G) is defined as G = H – TS and Helmholtz free energy (A) as A = E – TS, which of the following correctly represents the Gibbs-Helmholtz equation?

The partial derivative of (G/T) with respect to temperature equals –H divided by T squared, i.e., [∂(G/T)/∂T] = –H/T²At constant volume, the derivative of (A/T) with respect to temperature is –E over T squared, i.e., [∂(A/T)/∂T]_V = –E/T²Both the expressions in options A and B are correctNeither of the equations in options A or B is correctNone of the above

4.Entropy, a quantity that quantifies the disorder within a system, is characterized by which of the following?

Unaffected by changes in pressureUnaffected by variations in temperatureEqual to zero at absolute zero for an ideal crystalline materialAll of the above statements are true

5.What is the heat extraction rate corresponding to one ton of refrigeration?

50 kilocalories per hour200 BTUs per hour200 BTUs per minute200 BTUs per day

6.Which component is absent in both the vapor compression and absorption refrigeration systems?

Expansion deviceHeat exchanger (condenser)Cooling chamberCompressor

7.Lenz's law is derived from the principle of conservation of which quantity?

MassMomentumEnergyNone of the above

8.For a pure substance at constant temperature and pressure, what is the ratio of the Gibbs free energy to the chemical potential for one mole?

9.Which of the following remains constant throughout phase changes such as melting, sublimation, and vaporization?

EntropyGibbs free energyInternal energyAll of the above (A, B, and C)

10.How does the volume of a gas dissolved in a liquid change when the pressure is increased at a constant temperature?

It becomes largerIt reducesIt stays the sameIt can either increase or decrease depending on the type of gas

11.For the reaction N2 + O2 ⇌ 2NO, what is the effect of increasing the pressure on the position of equilibrium?

The equilibrium shifts to the product sideThe equilibrium moves toward the reactantsThe equilibrium position remains unchangedNone of the above

12.An ideal gas initially occupies 1 m³ at 500 K and 1000 kPa. It undergoes a reversible expansion to five times its original volume inside an insulated container. Given that the gas has a specific heat capacity at constant pressure of 21 J/mol·K, what is the final temperature of the gas?

35 Kelvin174 Kelvin274 Kelvin154 Kelvin

How to prepare with Thermodynamics for Chemical MCQs

Work through questions topic by topic, then revisit any you answered incorrectly.
Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
Pair subject practice with past papers to see how Thermodynamics for Chemical appears in real exam conditions.

Thermodynamics for Chemical

About this subject

Practice questions

1.Which of the following statements is accurate?

2.Given that Gibbs free energy (G) is defined as G = H – TS and Helmholtz free energy (A) as A = E – TS, which of the following correctly represents the Gibbs-Helmholtz equation?

3.Which law of thermodynamics is the basis for the operation of a refrigerator?

4.Entropy, a quantity that quantifies the disorder within a system, is characterized by which of the following?

5.What is the heat extraction rate corresponding to one ton of refrigeration?

6.Which component is absent in both the vapor compression and absorption refrigeration systems?

7.Lenz's law is derived from the principle of conservation of which quantity?

8.For a pure substance at constant temperature and pressure, what is the ratio of the Gibbs free energy to the chemical potential for one mole?

9.Which of the following remains constant throughout phase changes such as melting, sublimation, and vaporization?

10.How does the volume of a gas dissolved in a liquid change when the pressure is increased at a constant temperature?

11.For the reaction N2 + O2 ⇌ 2NO, what is the effect of increasing the pressure on the position of equilibrium?

12.An ideal gas initially occupies 1 m³ at 500 K and 1000 kPa. It undergoes a reversible expansion to five times its original volume inside an insulated container. Given that the gas has a specific heat capacity at constant pressure of 21 J/mol·K, what is the final temperature of the gas?

13.For which type of processes can work be determined using the integral expression ∫ p dA?

14.The transmission of sound waves through air is an example of which type of thermodynamic process?

15.Which of the following traits is considered undesirable for a refrigerant?

How to prepare with Thermodynamics for Chemical MCQs

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