4

Enthalpy

Entropy

Pressure

None of these

A. Enthalpy

4

# In an ideal solution, the activity of a component equals its

Mole fraction

Fugacity at the same temperature and pressure

Partial pressure

None of these

4

# If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will

Increase

Decrease

Remain unaltered

Increase or decrease; depends on the particular reaction

4

# The necessary condition for phase equilibrium in a multiphase system of N components is that the

Chemical potentials of a given component should be equal in all phases

Chemical potentials of all components should be same in a particular phase

Sum of the chemical potentials of any given component in all the phases should be the same

None of these

4

# Pick out the undesirable property for a good refrigerant.

High thermal conductivity

Low freezing point

Large latent heat of vaporisation

High viscosity

4

# dW and dq are not the exact differential, because q and W are

State functions

Path functions

Intensive properties

Extensive properties

4

12 P1V1

6 P1 V1

3 P1V1

P1 V1

4

30554

10373

4988.4

4364.9

4

0

1

2

3

4

# The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation.

Van Laar

Margules

Gibbs-Duhem

Gibbs-Duhem-Margules

4

# Entropy is a/an

State function

Macroscopic property

Extensive property

None of these

4

# Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the

Low pressure and high temperature

Low pressure and low temperature

High pressure and low temperature

High pressure and high temperature

4

# The internal energy of a gas obeying P (V - b) RT (where, b is a positive constant and has a constant Cv), depends upon its

Pressure

Volume

Temperature

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

4

# Van Laar equation deals with the activity coefficients in

Binary solutions

Ternary solutions

Azeotropic mixture only

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

# With increase in temperature, the atomic heat capacities of all solid elements

Increases

Decreases

Remains unchanged

Decreases linearly

4

0

50

100

4

0

+ve

-ve

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

4

# Claude gas liquefaction process employs cooling

At constant pressure

By throttling

By expansion in an engine

None of these

4

# Compound having large heat of formation is

More stable

Less stable

Not at all stable (like nascent O2)

Either more or less stable; depends on the compound

4

Zero

Positive

Negative

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

1

0

-ve

4

# Fugacity and pressure are numerically not equal for the gases

At low temperature and high pressure

At standard state

Both (A) and (B)

In ideal state

4

3

4

5

6

4

# Linde gas liquefaction process employs cooling

By throttling

By expansion in an engine

At constant pressure

None of these

4

# Pick out the correct statement.

The available energy in an isolated system for all irreversible (real) processes decreases

The efficiency of a Carnot engine increases, if the sink temperature is decreased

The reversible work for compression in non-flow process under isothermal condition is the change in Helmholtz free energy

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

4

# Throttling process is a/an __________ process.

Reversible and isothermal

Irreversible and constant enthalpy

Reversible and constant entropy

Reversible and constant enthalpy

4

# Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor?

d ln p/dt = Hvap/RT2

d ln p/dt = RT2/Hvap

dp/dt = RT2/Hvap

dp/dt = Hvap/RT2