4

# Boyle's law for gases states that

P ∝ 1/V, when temperature is constant

P ∝ 1/V, when temperature & mass of the gas remain constant

P ∝ V, at constant temperature & mass of the gas

P/V = constant, for any gas

B. P ∝ 1/V, when temperature & mass of the gas remain constant

4

# For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.

Decreases

Increases

Remain same

Decreases linearly

4

# Which of the following will increase the volume of a real gas by four times?

Doubling the absolute temperature as well as pressure of the gas

Reducing pressure to one fourth at constant temperature

Reducing temperature to one fourth at constant pressure

Reducing the temperature to half and doubling the pressure

4

# The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture. This is

The statement as per Gibbs-Helmholtz

Called Lewis-Randall rule

Henry's law

None of these

4

0

273

25

None of these

4

# Work done may be calculated by the expression ∫ p dA for __________ processes.

Non-flow reversible

Both (A) and (B)

Neither (A) nor (B)

4

Molecular size

Volume

Pressure

Temperature

4

T1/(T1-T2)

T2/(T1-T2)

T1/T2

T2/R1

4

P1ACBP2P1

ACBB1A1A

ACBDA

4

-1.87

0

1.26

3.91

4

# Second law of thermodynamics is concerned with the

Amount of energy transferred

Direction of energy transfer

Irreversible processes only

Non-cyclic processes only

4

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

Turbine

Heat engine

Reversed heat engine

None of these

4

# Boyle's law for gases states that

P ∝ 1/V, when temperature is constant

P ∝ 1/V, when temperature & mass of the gas remain constant

P ∝ V, at constant temperature & mass of the gas

P/V = constant, for any gas

4

# Claude gas liquefaction process employs cooling

At constant pressure

By throttling

By expansion in an engine

None of these

4

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

Isothermal process

Isobaric process

All require same work

4

# Dry ice is

Moisture free ice

Solid helium

Solid carbon dioxide

None of these

4

# Boiling of liquid is accompanied with increase in the

Vapor pressure

Specific Gibbs free energy

Specific entropy

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

4

# What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.)?

TR/(T2 - TR) × (T1 - T2)/T1

TR/(T2 - TR) × T1/(T1 - T2)

TR/(T1 - TR) × (T1 - T2)/T1

None of these

4

Mass

Momentum

Energy

None of these

4

# Which of the following is not an equation of state?

Bertholet equation

Clausius-Clapeyron equation

Beattie-Bridgeman equation

None of these

4

Increase

Decrease

No change

None of these

4

# Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be

Same

Doubled

Halved

One fourth of its original value

4

# Clapeyron Equation deals with the

Rate of change of vapour pressure with temperature

Effect of an inert gas on vapour pressure

Calculation of ΔF for spontaneous phase change

Temperature dependence of heat of phase transition

4

Zero

One

Infinity

Negative

4

2.73

28.3

273

283

4

J/s

J.S

J/kmol

kmol/J

4

Entropy

Temperature

Internal energy

Enthalpy

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

T2/(T1 - T2)

T1/(T1 - T2)

(T1 - T2)/T1

(T1 - T2)/T2

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

# 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)