Chemical Engineering Thermodynamics

Question: A gas has a volume of 27.3 c.c. at 0°C. Its volume at 10°C (if pressure remains unchanged) will be __________ c.c.
[A].

2.73

[B].

28.3

[C].

273

[D].

283

Answer: Option B

Explanation:

No answer description available for this question.

Question: If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be __________ c.c.
[A].

100

[B].

50

[C].

205

[D].

200

Answer: Option D

Explanation:

No answer description available for this question.

Question: For an ideal gas, the enthalpy
[A].

increases with rise in pressure.

[B].

decreases with rise in pressure.

[C].

is independent of pressure.

[D].

is a path function.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Claussius-Clayperon equation gives accurate result, when the
[A].

vapour pressure is relatively low and the temperature does not vary over wide limits.

[B].

vapour obeys the ideal gas law and the latent heat of vaporisation is constant.

[C].

volume in the liquid state is negligible compared with that in the vapour state.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be
[A].

580

[B].

640

[C].

1160

[D].

data insufficient; can’t be computed

Answer: Option C

Explanation:

No answer description available for this question.

Question: A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres.
[A].

448

[B].

224

[C].

22.4

[D].

data insufficient; can’t be computed

Answer: Option A

Explanation:

No answer description available for this question.

Question: “The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances”. This is the
[A].

Lewis-Randall rule.

[B].

statement of Vant-Hoff equation.

[C].

Le-Chatelier’s principle.

[D].

none of these.

Answer: Option D

Explanation:

No answer description available for this question.

Question: 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.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which
[A].

a homogeneous solution (say of phenol water) is formed.

[B].

mutual solubility of the two liquids shows a decreasing trend.

[C].

two liquids are completely separated into two layers.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Heat of reaction at constant volume is identified with __________ change.
[A].

enthalpy

[B].

internal energy

[C].

either (a) or (b)

[D].

neither (a) nor (b)

Answer: Option B

Explanation:

No answer description available for this question.