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Question: A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is Φi yi P = Yi xi fi° where, Φ is a vapor fugacity component, Yi is the liquid activity co-efficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of
[A].

temperature only.

[B].

temperature and pressure only.

[C].

temperature, pressure and liquid composition xi only.

[D].

temperature, pressure, liquid composition xi and vapour composition yi.

Answer: Option C

Explanation:

No answer description available for this question.

Question: On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv)
[A].

(∂P/∂V)S = (∂P/∂V)T

[B].

(∂P/∂V)S = [(∂P/∂V)T]Y

[C].

(∂P/∂V)S = y(∂P/∂V)T

[D].

(∂P/∂V)S = 1/y(∂P/∂V)T

Answer: Option C

Explanation:

No answer description available for this question.

Question: A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system are
[A].

4

[B].

3

[C].

5

[D].

6

Answer: Option B

Explanation:

No answer description available for this question.

Question: If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as
[A].

solubility increases as temperature increases.

[B].

solubility increases as temperature decreases.

[C].

solubility is independent of temperature.

[D].

solubility increases or decreases with temperature depending on the Gibbs free energy change of solution.

Answer: Option B

Explanation:

No answer description available for this question.

Question: It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.
[A].

The amount of work needed is path dependent.

[B].

Work alone can not bring out such a change of state.

[C].

The amount of work needed is independent of path.

[D].

More information is needed to conclude anything about the path dependence or otherwise of the work needed.

Answer: Option A

Explanation:

No answer description available for this question.

Question: A change in state involving a decrease in entropy can be spontaneous, only if
[A].

it is exothermic.

[B].

it is isenthalpic.

[C].

it takes place isothermally.

[D].

it takes place at constant volume.

Answer: Option A

Explanation:

No answer description available for this question.

Question: A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then(where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively)
[A].

Δ S1 is always < Δ SR

[B].

Δ S1 is sometimes > Δ SR

[C].

Δ S1 is always > Δ SR

[D].

Δ S1 is always = Δ SR

Answer: Option C

Explanation:

No answer description available for this question.

Question: A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system
[A].

its internal energy (U) decreases and its entropy (S) increases.

[B].

U and S both decreases

[C].

U decreases but S is constant.

[D].

U is constant but S decreases.

Answer: Option B

Explanation:

No answer description available for this question.

Question: In any spontaneous process, the __________ free energy decreases.
[A].

Helmholtz

[B].

Gibbs

[C].

both a & b

[D].

neither ‘a’ nor ‘b’

Answer: Option C

Explanation:

No answer description available for this question.