4

0

+ ve

- ve

D. - ve

4

If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the

Maxwell's equation

Clausius-Clapeyron Equation

Van Laar equation

Nernst Heat Theorem

4

__________ increases with increase in pressure.

The melting point of wax

The boiling point of a liquid

Both (A) and (B)

Neither (A) nor (B)

4

ds = 0

ds <0

ds > 0

ds = Constant

4

Gibbs-Duhem

Gibbs-Helmholtz

Maxwell's

None of these

4

Concentration

Mass

Temperature

Entropy

4

Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the

Calorific value

Heat of reaction

Heat of combustion

Heat of formation

4

The compressibility factor for an ideal gas is 1. Its value for any other real gas is

1

< 1

> 1

Either (B) or (C), depends on the nature of the gas

4

The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is

(∂T/∂V)S = - (∂P/∂S)V

(∂S/∂P)T = - (∂V/∂T)P

(∂V/∂S)P = (∂T/∂P)S

(∂S/∂V)T = (∂P/∂T)V

4

35 K

174 K

274 K

154 K

4

Specific volume

Work

Pressure

Temperature

4

(T2 - T1)/T2

(T2 - T1)/T1

(T1 - T2)/T2

(T1 - T2)/T1

4

Clausius-Clapeyron Equation gives accurate result, when the

Vapour pressure is relatively low and the temperature does not vary over wide limits

Vapour obeys the ideal gas law and the latent heat of vaporisation is constant

Volume in the liquid state is negligible compared with that in the vapour state

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

4

After throttling, gas temperature

Decreases

Increases

Remain same

May increase or decrease; depends on the nature of the gas

4

Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is

Superheated vapour

Partially condensed vapour with quality of 0.9

Saturated vapour

Partially condensed vapour with quality of 0.1

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

Critical compressibility factor for all substances

Are more or less constant (vary from 0.2 to 0.3)

Vary as square of the absolute temperature

Vary as square of the absolute pressure

None of these

4

Pick out the correct statement.

Entropy and enthalpy are path functions

In a closed system, the energy can be exchanged with the surrounding, while matter cannot be exchanged

All the natural processes are reversible in nature

Work is a state function

4

6738.9

6753.5

7058.3

9000

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

In an ideal refrigeration cycle, the change in internal energy of the fluid is

+ve

-ve

0

Either of the above three; depends on the nature of refrigerant

4

The most important application of distribution law is in

Evaporation

Liquid extraction

Drying

Distillation

4

Isochoric

Isobaric

Isothermal

4

Work done in an adiabatic process between two states depends on the

Rate of heat transmission

Initial state only

End states only

None of these

4

Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O CO2 + H2, by

Low temperature and high pressure

Low temperature and low pressure

High temperature and high pressure

High temperature and low pressure

4

Water

Air

Evaporative

Gas

4

Entropy of a substance remains constant during a/an __________ change.

Reversible isothermal

Irreversible isothermal

None of these

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

Reversible

Irreversible

Isothermal

4

At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero. This follows from the

Third law of thermodynamics

Second law of thermodynamics

Nernst heat theorem

Maxwell's relations