4

# For a multi-component system, the term chemical potential is equivalent to the

Molal concentration difference

Molar free energy

Partial molar free energy

Molar free energy change

C. Partial molar free energy

4

# Which of the following non-flow reversible compression processes require maximum work?

Isothermal process

Isobaric process

All require same work

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

dE = CpdT

dE = CvdT

dQ = dE + pdV

dW = pdV

4

T2/(T1 - T2)

T1/(T1 - T2)

(T1 - T2)/T1

(T1 - T2)/T2

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

0

+ve

-ve

4

A = H - TS

A = E - TS

A = H + TS

None of these

4

# The unit of fugacity is the same as that of the

Pressure

Temperature

Volume

Molar concentration

4

Isothermal

Isentropic

None of these

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

0

1

2

3

4

# Pick out the correct statement:

In an isothermal system, irreversible work is more than reversible work

Under reversible conditions, the adiabatic work is less than isothermal work

Heat, work, enthalpy and entropy are all 'state functions'

Matter and energy cannot be exchanged with the surroundings in a closed system

4

Isothermal

Isentropic

Polytropic

4

# What happens in a reversible adiabatic compression?

Heating occurs

Cooling occurs

Pressure is constant

Temperature is constant

4

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

Sublimation

Vaporisation

Melting

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

4

Pressure

Volume

Mass

None of these

4

Zero

Unity

Infinity

None of these

4

# Pick out the wrong statement:

The expansion of a gas in vacuum is an irreversible process

An isometric process is a constant pressure process

Entropy change for a reversible adiabatic process is zero

Free energy change for a spontaneous process is negative

4

5 & 3

3.987 & 1.987

1.987 & 0.66

0.66 & 1.987

4

Specific volume

Temperature

Mass

Pressure

4

Isolated

Open

Insulated

Closed

4

# In the reaction, H2 +I2 2HI, addition of an inert gas will

Increase the partial pressure of H2

Increase the partial pressure of I2

Increase the total pressure and hence shift the equilibrium towards the right

Not affect the equilibrium conditions

4

Lewis-Randall

Margules

Van Laar

Both (B) & (C)

4

# The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise.

Increases

Decreases

Remains unchanged

Decreases linearly

4

Minimum

Zero

Maximum

None of these

4

# If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will

Increase

Decrease

Remain unaltered

Increase or decrease; depends on the particular reaction

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

SO2

NH3

CCl2F2

C2H4Cl2

4

# With increase in temperature, the internal energy of a substance

Increases

Decreases

Remains unchanged

May increase or decrease; depends on the substance