4

# Specific/molar Gibbs free energy for a pure substance does not change during

Sublimation

Vaporisation

Melting

Either (A), (B) or (C)

D. Either (A), (B) or (C)

4

Sublimation

Fusion

Transition

Vaporisation

4

Concentration

Mass

Temperature

Entropy

4

dQ = dE + dW

dQ = dE - dW

dE = dQ + dW

dW = dQ + dE

4

# In an ideal solution, the activity of a component equals its

Mole fraction

Fugacity at the same temperature and pressure

Partial pressure

None of these

4

# Kopp's rule is used to calculate the heat capacity of

Solids

Liquids

Gases

All (A), (B) & (C)

4

Isothermal

Isobaric

Polytropic

4

# (∂T/∂P)H is the mathematical expression for

Specific heat at constant pressure (Cp)

Specific heat at constant volume (Cv)

Joule-Thompson co-efficient

None of these

4

# The expression, ΔG = nRT. ln(P2/P1), gives the free energy change

With pressure changes at constant temperature

Under reversible isothermal volume change

During heating of an ideal gas

During cooling of an ideal gas

4

# Joule-Thomson co-efficient depends on the

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

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

4

(T2 - T1)/T2

(T2 - T1)/T1

(T1 - T2)/T2

(T1 - T2)/T1

4

1st

Zeroth

3rd

None of these

4

Gibbs-Duhem

Van Laar

Gibbs-Helmholtz

Margules

4

Zero

Negative

More than zero

Indeterminate

4

Conduction

Convection

Condensation

4

No

Any real

Only ideal

Both (B) and (C)

4

# Critical solution temperature (or the consolute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which

A homogeneous solution (say of phenol water) is formed

Mutual solubility of the two liquids shows a decreasing trend

Two liquids are completely separated into two layers

None of these

4

# Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be

580

640

1160

Data insufficient; can't be computed

4

Zeroth

First

Second

Third

4

# Pick out the correct statement.

Compression ratio of an Otto engine is comparatively higher than a diesel engine

Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio

Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work produced per quantity of heat

Diesel engine normally operates at lower compression ratio than an Otto engine for an equal output of work

4

# The heat capacities for the ideal gas state depend upon the

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

4

# Entropy is a/an

State function

Macroscopic property

Extensive property

None of these

4

Stirling

Brayton

Rankine

None of these

4

0

1

2

3

4

# Free energy

Decreases in all spontaneous (or irreversible) processes

Change during a spontaneous process has a negative value

Remains unchanged in reversible processes carried at constant temperature and pressure

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

4

n = y = 1.4

n = 0

n = 1

n = 1.66

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

# The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by

(R/ΔH) (1/T1 - 1/T2)

(ΔH/R) (1/T1 - 1/T2)

(ΔH/R) (1/T2 - 1/T1)

(1/R) (1/T1 - 1/T2)

4

# Which of the following is Virial equation of state?

(p + a/V2)(V - b) = nRT

PV = nRT

PV = A + B/V + C/V2 + D/V3 + ...

None of these