Chemical Engineering Thermodynamics

Question: “At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero”. This follows from the
[A].

third law of thermodynamics

[B].

second law of thermodynamics

[C].

Nernst heat theorem

[D].

Maxwell’s relations

Answer: Option A

Explanation:

No answer description available for this question.

Question: For an ideal gas, the activity co-efficient is
[A].

directly proportional to pressure.

[B].

inversely proportional to pressure.

[C].

unity at all pressures.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: For a given substance at a specified temperature, activity is __________ to fugacity.
[A].

directly proportional

[B].

inversely proportional

[C].

equal

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Fugacity is most helpful in
[A].

representing actual behaviour of real gases.

[B].

representing actual behaviour of ideal gases.

[C].

the study of chemical equilibria involving gases at atmospheric pressure.

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: For a multicomponent system, the term chemical potential is equivalent to the
[A].

molal concentration difference.

[B].

molar free energy.

[C].

partial molar free energy.

[D].

molar free energy change.

Answer: Option C

Explanation:

No answer description available for this question.

Question: At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be
[A].

more

[B].

less

[C].

same

[D].

more or less ; depending on the system.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Free energy
[A].

decreases in all spontaneous (or irreversible) processes.

[B].

change during a spontaneous process has a negative value.

[C].

remains unchanged in reversible processes carried at constant temperature and pressure.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: For a spontaneous process, free energy
[A].

is zero

[B].

increases

[C].

decreases whereas the entropy increases

[D].

and entropy both decrease

Answer: Option C

Explanation:

No answer description available for this question.

Question: Free energy change at equilibrium is
[A].

zero

[B].

positive

[C].

negative

[D].

indeterminate

Answer: Option A

Explanation:

No answer description available for this question.

Question: Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is – 57°C and 5.2 atm).
[A].

Pressure must be kept below 5.2 atm.

[B].

Temperature must be kept above – 57°C.

[C].

Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C.

[D].

Pressure and temperature must be kept below 5.2 atm. and – 57°C respectively.

Answer: Option D

Explanation:

No answer description available for this question.