4

Cp < Cv

Cp = Cv

Cp > Cv

C ≥ Cv

B. Cp = Cv

4

# Pick out the wrong statement.

Minimum number of degree of freedom of a system is zero

Degree of freedom of a system containing a gaseous mixture of helium, carbon dioxide and hydrogen is 4

For a two phase system in equilibrium made up of four non-reacting chemical species, the number of degrees of freedom is 4

Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation

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

# 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

Kelvin's

Antoines

Kirchoffs

None of these

4

# For an ideal gas, the enthalpy

Increases with rise in pressure

Decreases with rise in pressure

Is independent of pressure

Is a path function

4

# As the time is passing, entropy of the universe

Is increasing

Is decreasing

Remain constant

Data insufficient, can't be predicted

4

Zero

Unity

Infinity

Negative

4

Negative

Zero

Infinity

None of these

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

# Refrigerants commonly used for domestic refrigerators are

Ethyl chloride or methyl chloride

Freon-12

Propane

NH3 or CO2

4

# The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture. This is

The statement as per Gibbs-Helmholtz

Called Lewis-Randall rule

Henry's law

None of these

4

# Free energy change of mixing two liquid substances is a function of the

Concentration of the constituents only

Quantities of the constituents only

Temperature only

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

4

CO2

H2

O2

N2

4

# What happens in a reversible adiabatic compression?

Heating occurs

Cooling occurs

Pressure is constant

Temperature is constant

4

A . x22

Ax1

Ax2

Ax12

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

# For a multi-component system, the term chemical potential is equivalent to the

Molal concentration difference

Molar free energy

Partial molar free energy

Molar free energy change

4

# Out of the following refrigeration cycles, which one has maximum COP?

Air cycle

Carnot cycle

Ordinary vapor compression cycle

Vapor compression with a reversible expansion engine

4

# (∂E/∂T)V is the mathematical expression for

CV

Enthalpy change

Free energy change

None of these

4

# Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is

Slower than Y

Faster than Y

Three times slower than Y

Three times faster than Y

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

# Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C and 5.2 atm).

Pressure must be kept below 5.2 atm

Temperature must be kept above - 57°C

Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C

Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively

4

# Equilibrium constant of a reaction varies with the

Initial concentration of the reactant

Pressure

Temperature

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

# Which is an example of closed system?

Air compressor

Liquid cooling system of an automobile

Boiler

None of these

4

# Which of the following is an extensive property of a system?

Heat capacity

Molal heat capacity

Pressure

Concentration

4

# The extensive properties are

Volume, mass and number of moles

Free energy, entropy and enthalpy

Both (A) and (B)

None of these

4

# The unit of fugacity is the same as that of the

Pressure

Temperature

Volume

Molar concentration

4

12 P1V1

6 P1 V1

3 P1V1

P1 V1