4

# On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will

Increase

Decrease

Remain same

Increase in summer and will decrease in winter

A. Increase

4

# Entropy change of mixing two liquid substances depends upon the

Molar concentration

Quantity (i.e. number of moles)

Both (A) and (B)

Neither (A) nor (B)

4

# In the ammonia synthesis reaction, N2 + 3H2 2NH3 + 22.4 kcal, the formation of NH3 will be favoured by

High temperature

Low pressure

Low temperature only

Both low temperature and high pressure

4

0

+ve

-ve

4

Isothermal

Isentropic

None of these

4

Zeroth

First

Second

Third

4

Negative

Zero

Infinity

None of these

4

# The total change in the enthalpy of a system is independent of the

Number of intermediate chemical reactions involved

Pressure and temperature

State of combination and aggregation in the beginning and at the end of the reaction

None of these

4

# Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the

Two temperatures only

Pressure of working fluid

Mass of the working fluid

Mass and pressure both of the working fluid

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

# Pick out the wrong statement.

Minimum number of degree of freedom of a system is zero

Degree of freedom of a system containing a gaseous mixture of helium, carbon dioxide and hydrogen is 4

For a two phase system in equilibrium made up of four non-reacting chemical species, the number of degrees of freedom is 4

Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation

4

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

Triple point

Boiling point

Below triple point

Always

4

# High __________ is an undesirable property for a good refrigerant.

Specific heat

Latent heat of vaporisation

Viscosity

Specific vapor volume

4

Less than

More than

Same as

Not related to

4

-ve

0

+ve

4

The same

Less than

Greater than

Different than

4

# Fugacity co-efficient of a substance is the ratio of its fugacity to

Mole fraction

Activity

Pressure

Activity co-efficient

4

Only ΔE = 0

Only ΔH =0

ΔE = ΔH = 0

dQ = dE

4

dE = Tds - PdV

dQ = CvdT + PdV

dQ = CpdT + Vdp

Tds = dE - PdV

4

Saturated vapour

Solid

Gas

Liquid

4

# The intensive properties are

Molar volume, density, viscosity and boiling point

Refractive index and surface tension

Both (A) and (B)

None of these

4

# Joule-Thomson co-efficient depends on the

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

4

# Adiabatic compression of a saturated water vapour makes it

Supersaturated

Superheated

Both (A) and (B)

Neither (A) nor (B)

4

1

2

3

4

4

0

1

2

3

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

# After throttling, gas temperature

Decreases

Increases

Remain same

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

4

Stirling

Brayton

Rankine

None of these

4

# What happens in a reversible adiabatic compression?

Heating occurs

Cooling occurs

Pressure is constant

Temperature is constant

4

0

1

2

3