4

Zero

Unity

Infinity

None of these

A. Zero

4

# For an ideal gas, the enthalpy

Increases with rise in pressure

Decreases with rise in pressure

Is independent of pressure

Is a path function

4

# Solid and liquid phases of a substance are in equilibrium at the

Critical temperature

Melting point

Freezing point

Both (B) and (C)

4

Fusion

Vaporisation

Transition

None of these

4

# Third law of thermodynamics is helpful in

Prediction of the extent of a chemical reaction

Calculating absolute entropies of substances at different temperature

Evaluating entropy changes of chemical reaction

Both (B) and (C)

4

# The most important application of distribution law is in

Evaporation

Liquid extraction

Drying

Distillation

4

# Clapeyron Equation deals with the

Rate of change of vapour pressure with temperature

Effect of an inert gas on vapour pressure

Calculation of ΔF for spontaneous phase change

Temperature dependence of heat of phase transition

4

# As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine is

Not changed

Decreasing

Increasing

Data sufficient, can't be predicted

4

# A solute distributes itself between two nonmiscible 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

The distribution law

Followed from Margules equation

A corollary of Henry's law

None of these

4

Zero

Positive

Negative

None of these

4

Only ΔE = 0

Only ΔH =0

ΔE = ΔH = 0

dQ = dE

4

# A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system

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

U and S both decreases

U decreases but S is constant

U is constant but S decreases

4

Straight line

Sine curve

Parabola

Hyperbola

4

ds = 0

ds < 0

ds > 0

ds = Constant

4

# Gibbs free energy per mole for a pure substance is equal to the

Latent heat of vaporisation

Chemical potential

Molal boiling point

Heat capacity

4

# Heat of reaction at constant volume is identified with __________ change.

Enthalpy

Internal energy

Either (A) or (B)

Neither (A) nor (B)

4

# Fugacity and pressure are numerically equal, when the gas is

In standard state

At high pressure

At low temperature

In ideal state

4

# Which of the following decreases with increase in pressure?

Melting point of ice

Melting point of wax

Boiling point of liquids

None of these

4

# High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:

Δ H = 0 and ΔS = 0

Δ H ≠ 0 and ΔS = 0

Δ H ≠ 0 and ΔS ≠ 0

Δ H = 0 and ΔS ≠ 0

4

# When pressure is applied on the system, ice ↔ water, then

Equilibrium cannot be established

More ice will be formed

More water will be formed

Evaporation of water will take place

4

Zero

Unity

Infinity

Negative

4

P + F - C = 2

C = P - F + 2

F = C - P - 2

P = F - C - 2

4

# Co-efficient of Performance (COP) of a refrigerator is the ratio of the

Work required to refrigeration obtained

Refrigeration obtained to the work required

Lower to higher temperature

Higher to lower temperature

4

Zeroth

First

Second

Third

4

# Which of the following represents the Virial equation of state?

T = [RT/(V- b)] - [a/√T. V(V + b)]

PV/RT = 1 + (B/V) + (C/V2) + ……

n1u2 + μ2μ1 = 0

None of these

4

# Pick out the correct statement.

Like internal energy and enthalpy, the absolute value of standard entropy for elementary substances is zero

Melting of ice involves increase in enthalpy and a decrease in randomness

The internal energy of an ideal gas depends only on its pressure

Maximum work is done under reversible conditions

4

V/T = Constant

V ∝ 1/T

V ∝ 1/P

PV/T = Constant

4

# The extensive properties are

Volume, mass and number of moles

Free energy, entropy and enthalpy

Both (A) and (B)

None of these

4

# Boiling of liquid is accompanied with increase in the

Vapor pressure

Specific Gibbs free energy

Specific entropy

All (A), (B) and (C)

4

# Gibbs-Duhem equation

States that n11 + n22 + ....njj = 0, for a system of definite composition at constant temperature and pressure

Applies only to binary systems

Finds no application in gas-liquid equilibria involved in distillation

None of these