Chemical Engineering Thermodynamics MCQs

Question 1

For an ideal solution, the value of activity co-efficient is

Accepted Answer

1

Answer

0

Answer

< 1

Answer

> 1

Question 2

The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while freezing.

Accepted Answer

Contracts

Answer

Expands

Answer

Does not change in volume

Answer

Either A, B or C

Question 3

A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor.

Accepted Answer

Open

Answer

Isolated

Answer

Closed

Answer

None of these

Question 4

During Joule-Thomson expansion of gases

Accepted Answer

Enthalpy remains constant

Answer

Entropy remains constant

Answer

Temperature remains constant

Answer

None of these

Question 5

The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is

Accepted Answer

R loge 4

Answer

R log10 4

Answer

Cv log10 4

Answer

Cv loge 4

Question 6

Pick out the wrong statement.

Accepted Answer

The chemical potential of ith species (μi) in an ideal gas mixture approaches zero as the pressure or mole fraction (xi) tends to be zero at constant temperature

Answer

The chemical potential of a pure substance depends upon the temperature and pressure

Answer

The chemical potential of a component in a system is directly proportional to the escaping tendency of that component

Answer

None of these

Question 7

As pressure approaches zero, the ratio of fugacity to pressure $$\left( {\frac{{	ext{f}}}{{	ext{P}}}} ight)$$ for a gas approaches

Accepted Answer

Unity

Answer

Zero

Answer

Infinity

Answer

An indeterminate value

Question 8

The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each at 1 atm is

Accepted Answer

-RT ln 0.5

Answer

-2 RT ln 0.5

Answer

0.5 RT

Answer

2 RT

Question 9

When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is

Accepted Answer

Same in both the phases

Answer