4

Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are

Always greater than one

Same at the same reduced temperature

Same at the same reduced pressure

Both (B) & (C)

D. Both (B) & (C)

4

√(2KT/m)

√(3KT/m)

√(6KT/m)

3KT/m

4

Compressibility factor for almost all the gases are approximately same at the same

Pressure and temperature

Reduced pressure and reduced temperature

Critical pressure and critical temperature

None of these

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

When a gas is expanded from high pressure region to low pressure region; temperature change occurs. This phenomenon is related to the

Gibbs-Duhem equation

Gibbs-Helmholtz equation

Third law of thermodynamics

Joule-Thomson effect

4

Heat of reaction at constant volume is identified with __________ change.

Enthalpy

Internal energy

Either (A) or (B)

Neither (A) nor (B)

4

Isobaric

Isenthalpic

Both (B) & (C)

4

A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively)

Δ S1 is always < Δ SR

Δ S1 is sometimes > Δ SR

Δ S1 is always > Δ SR

Δ S1 is always = Δ SR

4

5 & 3

3.987 & 1.987

1.987 & 0.66

0.66 & 1.987

4

In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants)

Addition of inert gas favours the forward reaction, when Δx is positive

Pressure has no effect on equilibrium, when Δn = 0

Addition of inert gas has no effect on the equilibrium constant at constant volume for any value of Δx (+ ve, - ve) or zero)

All 'a', 'b' & 'c'

4

Pick out the wrong statement.

A refrigeration cycle violates the second law of thermodynamics

Refrigeration cycle is normally represented by a temperature vs. entropy plot

In a refrigerator, work required decreases as the temperature of the refrigerator and the temperature at which heat is rejected increases

One ton of refrigeration is equivalent to the rate of heat absorption equal to 3.53 kW

4

Zeroth

First

Second

Third

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

-273

0

-78

5

4

0

< 0

< 1

> 1

4

Molecular size

Volume

Pressure

Temperature

4

Infinity

Minus infinity

Zero

None of these

4

Consider the process A & B shown in the figure given below: In this case, it is possible that

Both the processes are isothermal

Process A is isothermal while B is adiabatic

Process A is adiabatic while B is isothermal

4

In any spontaneous process,

Only F decreases

Only A decreases

Both F and A decreases

Both F and A increase

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

Zeroth

First

Second

Third

4

(∂H/∂T)P is the mathematical expression for

CV

Entropy change

Gibbs free energy

None of these

4

If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them. This is __________ law.

Hess's

Kirchoff's

Lavoisier and Laplace

None of these

4

Momentum

Mass

Energy

None of these

4

A gas shows deviation from ideal behaviour at

Low pressure and high temperature

Low pressure and low temperature

Low temperature and high pressure

High temperature and high pressure

4

Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates

Use of only one graph for all gases

Covering of wide range

Easier plotting

More accurate plotting

4

Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants)

(atm)Δx, when Δx is negative

(atm)Δx, when Δx is positive

Dimensionless, when Δx = 0

(atm)Δx2, when Δx > 0

4

Which of the following is not a reversible process?

Expansion of an ideal gas against constant pressure

Atmospheric pressure vaporisation of water at 100°C

Solution of NaCl in water at 50°C

None of these

4

Solution

Vaporisation

Formation

Sublimation

4

0

1

2

3