4

0°C

273°C

100°C

-273°C

D. -273°C

4

6738.9

6753.5

7058.3

9000

4

RT ln K

-RT ln K

-R ln K

T ln K

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

# Which of the following is not an intensive property?

Molar heat capacity

Internal energy

Viscosity

None of these

4

2

0

3

1

4

# Claude gas liquefaction process employs cooling

At constant pressure

By throttling

By expansion in an engine

None of these

4

# In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, the Carnot COP will be

5.2

6.2

0.168

Data insufficient, can't be found out

4

# The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

Less than

Equal to

More than

Either (B) or (C); depends on the type of alloy

4

+ve

-ve

0

4

270

327

300

540

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

# The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by

(∂E/∂ni)S, v, nj

(∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj

(∂H/∂ni)S, P, nj

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

4

# What happens in a reversible adiabatic expansion process?

Heating takes place

Cooling takes place

Pressure is constant

Temperature is constant

4

# Which of the following is true for Virial equation of state?

Virial co-efficients are universal constants

Virial co-efficients 'B' represents three body interactions

Virial co-efficients are function of temperature only

For some gases, Virial equations and ideal gas equations are the same

4

# __________ does not change during phase transformation processes like sublimation, melting & vaporisation.

Entropy

Gibbs free energy

Internal energy

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

4

Oxygen

Nitrogen

Air

Hydrogen

4

Endothermic

Exothermic

Isothermal

4

4 J

0

8 J

4

0

1

2

3

4

# Entropy of the system decreases, when

Snow melts into water

A gas expands spontaneously from high pressure to low pressure

Water is converted into ice

Both (B) & (C)

4

Zero

50%

Almost 100%

unpredictable

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

# In a homogeneous solution, the fugacity of a component depends upon the

Pressure

Composition

Temperature

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

4

# Specific volume of an ideal gas is

Equal to its density

The reciprocal of its density

Proportional to pressure

None of these

4

Specific volume

Work

Pressure

Temperature

4

# The energy of activation of exothermic reaction is

Zero

Negative

Very large compared to that for endothermic reaction

Not possible to predict

4

# When pressure is applied on the system, ice ↔ water, then

Equilibrium cannot be established

More ice will be formed

More water will be formed

Evaporation of water will take place

4

# When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the

Le-Chatelier principle

Kopp's rule

Law of corresponding state

Arrhenius hypothesis

4

Critical

Triple

Freezing

Boiling