4

Mass

Momentum

Energy

None of these

C. Energy

4

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

Bertholet equation

Clausius-Clapeyron equation

Beattie-Bridgeman equation

None of these

4

# PVy = constant, holds good for an isentropic process, which is

Reversible and isothermal

Isothermal and irreversible

4

0

+ve

-ve

4

# Gibbs free energy (G) is represented by, G = H - TS, whereas Helmholtz free energy, (A) is given by, A = E - TS. Which of the following is the Gibbs-Helmholtz equation?

[∂(G/T)/∂T] = - (H/T2)

[∂(A/T)/∂T]V = - E/T2

Both (A) and (B)

Neither (A) nor (B)

4

1.572

1.9398

3.389

4.238

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

Isothermal

Isometric

None of these

4

# For a spontaneous process, free energy

Is zero

Increases

Decreases whereas the entropy increases

And entropy both decrease

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

# 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

# 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

# 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

ds = 0

ds <0

ds > 0

ds = Constant

4

0

+ve

-ve

4

T2/(T1 - T2)

T1/(T1 - T2)

(T1 - T2)/T1

(T1 - T2)/T2

4

0

1

2

3

4

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

Turbine

Heat engine

Reversed heat engine

None of these

4

# A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres.

448

224

22.4

Data insufficient; can't be computed

4

# Work done in an adiabatic process between two states depends on the

Rate of heat transmission

Initial state only

End states only

None of these

4

Free energy

Entropy

Refractive index

None of these

4

dQ = dE + dW

dQ = dE - dW

dE = dQ + dW

dW = dQ + dE

4

# Pick out the correct statement.

Compression ratio of an Otto engine is comparatively higher than a diesel engine

Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio

Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work produced per quantity of heat

Diesel engine normally operates at lower compression ratio than an Otto engine for an equal output of work

4

Solution

Vaporisation

Formation

Sublimation

4

# Which of the following exemplifies an adiabatic process?

Melting of ice

Condensation of alcohol vapor

Sudden bursting of a cycle tube

Evaporation of water

4

T

T and P

T, P and Z

T and Z

4

Critical

Boyle

Inversion

Reduced

4

Pressure

Volume

Mass

None of these

4

Low T, low P

High T, high P

Low T, high P

High T, low P

4

# The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition.

Internal energy

Enthalpy

Gibbs free energy

Helmholtz free energy

4

# In the reaction, H2 +I2 2HI, addition of an inert gas will

Increase the partial pressure of H2

Increase the partial pressure of I2

Increase the total pressure and hence shift the equilibrium towards the right

Not affect the equilibrium conditions