4

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

CV

Entropy change

Gibbs free energy

None of these

D. None of these

4

# Equilibrium constant of a reaction varies with the

Initial concentration of the reactant

Pressure

Temperature

None of these

4

# Throttling process is a/an __________ process.

Reversible and isothermal

Irreversible and constant enthalpy

Reversible and constant entropy

Reversible and constant enthalpy

4

Heat pump

Heat engine

Carnot engine

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

# 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

Increase

Decrease

Not alter

None of these

4

# For an ideal gas, the activity co-efficient is

Directly proportional to pressure

Inversely proportional to pressure

Unity at all pressures

None of these

4

# Co-efficient of Performance (COP) of a refrigerator is the ratio of the

Work required to refrigeration obtained

Refrigeration obtained to the work required

Lower to higher temperature

Higher to lower temperature

4

-19.4

-30.2

55.2

-55.2

4

# Pick out the wrong statement.

Trouton's ratio of non-polar liquids is calculated using Kistyakowsky equation

Thermal efficiency of a Carnot engine is always less than 1

An equation relating pressure, volume and temperature of a gas is called ideal gas equation

None of these

4

Bomb

Separating

Bucket

Throttling

4

# After throttling, gas temperature

Decreases

Increases

Remain same

May increase or decrease; depends on the nature of the gas

4

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

Positive

Negative

Zero

May be positive or negative

4

270

327

300

540

4

100

50

205

200

4

# Claude's liquefaction process employs the cooling of gases by

Expansion in an engine

Following a constant pressure cycle

Throttling

None of these

4

Specific volume

Work

Pressure

Temperature

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

# Entropy, which is a measure of the disorder of a system, is:

Independent of pressure

Independent of temperature

Zero at absolute zero temperature for a perfect crystalline substance

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

4

Zeroth

First

Second

Third

4

# With increase in compression ratio, the efficiency of the otto engine

Increases

Decreases

Remain constant

Increases linearly

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

Freon-12

Ethylene

Ammonia

Carbon dioxide

4

# Pick out the wrong statement

Phase rule variables are intensive properties

Heat and work are both state function

The work done by expansion of a gas in vacuum is zero

CP and CV are state function

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

Critical

Boyle

Inversion

Reduced

4

# On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will

Increase

Decrease

Remain same

Increase in summer and will decrease in winter

4

# Pick out the wrong statement.

Activity co-efficient is dimensionless.

In case of an ideal gas, the fugacity is equal to its pressure.

In a mixture of ideal gases, the fugacity of a component is equal to the partial pressure of the component.

The fugacity co-efficient is zero for an ideal gas

4

2

0

1

3