4

6738.9

6753.5

7058.3

9000

B. 6753.5

4

# During adiabatic expansion of gas

Pressure remains constant

Pressure is increased

Temperature remains constant

None of these

4

0

1

2

3

4

0

< 0

< 1

> 1

4

# What happens in a reversible adiabatic expansion process?

Heating takes place

Cooling takes place

Pressure is constant

Temperature is constant

4

# The change in Gibbs free energy for vaporisation of a pure substance is

Positive

Negative

Zero

May be positive or negative

4

# The internal energy of an incompressible fluid depends upon its

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

4

# The second law of thermodynamics states that

The energy change of a system undergoing any reversible process is zero

It is not possible to transfer heat from a lower temperature to a higher temperature

The total energy of system and surrounding remains the same

None of the above

4

# Refrigerants commonly used for domestic refrigerators are

Ethyl chloride or methyl chloride

Freon-12

Propane

NH3 or CO2

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

4

# Pick out the correct statement.

A real gas on expansion in vacuum gets heated up

An ideal gas on expansion in vacuum gets cooled

An ideal gas on expansion in vacuum gets heated up

A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

4

> 2

< 1

> 1

< 3

4

Heat pump

Heat engine

Carnot engine

None of these

4

Gibbs-Duhem

Van Laar

Gibbs-Helmholtz

Margules

4

# Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in

Increased COP

Same COP

Decreased COP

Increased or decreased COP; depending upon the type of refrigerant

4

Critical

Triple

Freezing

Boiling

4

# Chemical engineering thermodynamics is concerned with the __________ in/of chemical processes.

Reaction mechanism

Calculation of rates

Energy transformation from one form to another

None of these

4

# The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.

Kinematic viscosity

Work

Temperature

None of these

4

# Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 PCl3 + Cl2.Degree of dissociation of PCl5 will

Increase on addition of an inert gas at constant pressure

Decrease on increasing the pressure of the system

None of these

4

# If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the

Maxwell's equation

Clausius-Clapeyron Equation

Van Laar equation

Nernst Heat Theorem

4

Molten sodium

Mercury

Molten potassium

4

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

Bertholet equation

Clausius-Clapeyron equation

Beattie-Bridgeman equation

None of these

4

# Cp of a gas at its critical temperature and pressure

Becomes zero

Becomes infinity

Equals 1 kcal/kmol °K

Equals 0.24 kcal/kmol °K

4

1

2

3

4

4

μ = (∂P/∂T)H

μ = (∂T/∂P)H

μ = (∂E/∂T)H

μ = (∂E/∂P)H

4

1

< 1

> 1

>> 1

4

Entropy

Gibbs energy

Internal energy

Enthalpy

4

# __________ explains the equilibrium constant for any chemical reaction.

Henry's law

Law of mass action

Hess's law

None of these

4

# In Joule-Thomson porous plug experiment, the

Enthalpy does not remain constant

Entire apparatus is exposed to surroundings

Temperature remains constant

None of these

4

No

Any real

Only ideal

Both (B) and (C)