Thermodynamics MCQs Archives

441. Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called __________ solutions.

A. Ideal

B. Real

C. Isotonic

D. None of these

✅ The correct answer is option A.

442. A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount”. This is

A. The distribution law

B. Followed from Margule’s equation

C. A corollary of Henry’s law

D. None of these

✅ The correct answer is option A.

443. Which of the following is not an intensive property?

A. Chemical potential

B. Surface tension

C. Heat capacity

D. None of these

✅ The correct answer is option C.

444. Melting of ice exemplifies a/an

A. Adiabatic process

B. Endothermic reaction

C. Exothermic reaction

D. Process involving a chemical reaction

✅ The correct answer is option B.

445. After throttling, gas temperature

A. Decreases

B. Increases

C. Remains same

D. May increase or decrease ; depends on the nature of the gas

✅ The correct answer is option A.

446. At normal boiling point, molar entropy of vaporisation is __________ Joule/K°.mole.

A. 72

B. 92

C. 142

D. 192

✅ The correct answer is option B.

447. If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is __________ law.

A. Hess’s

B. Kirchoff’s

C. Lavoisier and Laplace

D. None of these

✅ The correct answer is option A.

448. Reduced pressure of a gas is the ratio of its

A. Pressure to critical pressure

B. Critical pressure to pressure

C. Pressure to pseudocritical pressure

D. Pseudocritical pressure to pressure

✅ The correct answer is option A.

449. The compressibility factor for an ideal gas is 1. Its value for any other real gas is

A. 1

B. < 1

C. > 1

D. Either (b) or (c), depends on the nature of the gas

✅ The correct answer is option D.

450. The adiabatic throttling process of a perfect gas is one of constant enthalpy

A. In which there is a temperature drop

B. Which is exemplified by a non-steady flow expansion

C. Which can be performed in a pipe with a constriction

D. In which there is an increase in temperature

✅ The correct answer is option C.