4

Momentum

Mass

Energy

None of these

C. Energy

4

Entropy

Temperature

Internal energy

Enthalpy

4

0

+ve

-ve

4

# For a spontaneous process, free energy

Is zero

Increases

Decreases whereas the entropy increases

And entropy both decrease

4

0°C

273°C

100°C

-273°C

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 heat capacities for the ideal gas state depend upon the

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

4

# In case of the decomposition of hydroiodic acid (2HI H2 + I2), addition of H2 (at equilibrium condition) will

Increase the partial pressure of I2

Decrease the partial pressure of HI

Diminish the degree of dissociation of HI

None of these

4

+ve

0

-ve

4

# Pick out the wrong statement.

System (of partially miscible liquid pairs), in which the mutual solubility increases with rise in temperature, are said to possess an upper consolute temperature

Systems, in which the mutual solubility increases with decrease in temperature, are said to possess lower consolute temperature

Nicotine-water system shows both an upper as well as a lower consolute temperature, implying that they are partially miscible between these two limiting temperatures

None of these

4

# A solute distributes itself between two nonmiscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount. This is

The distribution law

Followed from Margules equation

A corollary of Henry's law

None of these

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

# Third law of thermodynamics is concerned with the

Value of absolute entropy

Energy transfer

Direction of energy transfer

None of these

4

# Mollier diagram is a plot of

Temperature vs. enthalpy

Temperature vs. enthalpy

Entropy vs. enthalpy

Temperature vs. internal energy

4

# Which of the following is affected by the temperature?

Fugacity

Activity co-efficient

Free energy

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

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

0

+ve

-ve

4

# What happens in a reversible adiabatic compression?

Heating occurs

Cooling occurs

Pressure is constant

Temperature is constant

4

100

50

205

200

4

Two

One

Zero

Three

4

# __________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low.

Bucket

Throttling

Separating

A combination of separating & throttling

4

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

Pressure

Temperature

Volume

Molar concentration

4

# (1/V) (∂V/∂T)P is the mathematical expression

Joule-Thomson co-efficient

Specific heat at constant pressure (Cp)

co-efficient of thermal expansion

Specific heat at constant volume (CV)

4

# A refrigeration cycle is the same as a __________ cycle,

Turbine

Heat engine

Reversed heat engine

None of these

4

n = y = 1.4

n = 0

n = 1

n = 1.66

4

# Which of the following is an undesirable characteristic of a refrigerant?

It should be non-explosive

It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

Its vapor pressure at the condenser temperature should be very high

None of these

4

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

Triple point

Boiling point

Below triple point

Always

4

# Pick out the correct statement.

If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase

A process is irreversible as long as Δ S for the system is greater than zero

The mechanical work done by a system is always equal to∫P.dV

The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

4

3

1

2

0

4

Entropy

Gibbs energy

Internal energy

Enthalpy