4

# For a spontaneous process, free energy

Is zero

Increases

Decreases whereas the entropy increases

And entropy both decrease

C. Decreases whereas the entropy increases

4

# Heat pump

Accomplishes only space heating in winter

Accomplishes only space cooling in summer

Accomplishes both (A) and (B)

Works on Carnot cycle

4

Water

Ammonia

Freon

Brine

4

# Entropy of the system decreases, when

Snow melts into water

A gas expands spontaneously from high pressure to low pressure

Water is converted into ice

Both (B) & (C)

4

Expansion valve

Condenser

Refrigerator

Compressor

4

# An irreversible process

Is the analog of linear frictionless motion in machines

Is an idealised visualisation of behaviour of a system

Yields the maximum amount of work

Yields an amount of work less than that of a reversible process

4

# Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).

Entropy

Internal energy

Enthalpy

Gibbs free energy

4

# As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches

Unity

Zero

That of the heat of reaction

Infinity

4

# Entropy, which is a measure of the disorder of a system, is:

Independent of pressure

Independent of temperature

Zero at absolute zero temperature for a perfect crystalline substance

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

4

# A solid is transformed into vapour without going to the liquid phase at

Triple point

Boiling point

Below triple point

Always

4

Volume

Temperature

Pressure

None of these

4

Bomb

Separating

Bucket

Throttling

4

30554

10373

4988.4

4364.9

4

1

2

3

4

4

# Cv for an ideal gas

Does not depend upon temperature

Is independent of pressure only

Is independent of volume only

Is independent of both pressure and volume

4

F = E - TS

F = H - TS

F = H + TS

F = E + TS

4

RT ln K

-RT ln K

-R ln K

T ln K

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

# 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.

448

224

22.4

Data insufficient; can't be computed

4

Volume

Density

Temperature

Pressure

4

# Pick out the wrong statement.

The chemical potential of a pure substance depends upon the temperature and pressure

The chemical potential of a component in a system is directly proportional to the escaping tendency of that component

The chemical potential of ith species (μi) in an ideal gas mixture approaches zero as the pressure or mole fraction (xi) tends to be zero at constant temperature

The chemical potential of species 'i' in the mixture (μi) is mathematically represented as,μi = ∂(nG)/∂ni]T,P,nj where, n, ni and nj respectively denote the total number of moles, moles of ith species and all mole numbers except ith species. 'G' is Gibbs molar free energy

4

# In case of an __________ process, the temperature of the system increases.

Isothermal compression

Isothermal expansion

4

# Cp of a gas at its critical temperature and pressure

Becomes zero

Becomes infinity

Equals 1 kcal/kmol °K

Equals 0.24 kcal/kmol °K

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

4

Only ΔE = 0

Only ΔH =0

ΔE = ΔH = 0

dQ = dE

4

# In the reaction; N2 + O2 2NO, increasing the pressure will result in

Shifting the equilibrium towards right

Shifting the equilibrium towards left

No change in equilibrium condition

None of these

4

# When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is

Same in both the phases

Zero in both the phases

More in vapour phase

More in liquid phase

4

# Pick out the wrong statement.

The net change in entropy in any reversible cycle is always zero

The entropy of the system as a whole in an irreversible process increases

The entropy of the universe tends to a maximum

The entropy of a substance does not remain constant during a reversible adiabatic change

4

# As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches

Zero

Unity

Infinity

An indeterminate value

4

# Pick out the wrong statement.

The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction

With increase in temperature, the equilibrium constant increases for an exothermic reaction

The equilibrium constant of a reaction depends upon temperature only

The conversion for a gas phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction