4

# The unit of equilibrium constant of a chemical reaction is the same as that of

Molar concentration

Temperature

Internal energy

None of these

D. None of these

4

# The most important application of distribution law is in

Evaporation

Liquid extraction

Drying

Distillation

4

A = H - TS

A = E - TS

A = H + TS

None of these

4

CO2

H2

O2

N2

4

Molecular size

Volume

Pressure

Temperature

4

0.15

1.5

4.5

6.5

4

(∂E/∂T)V

(∂E/∂V)T

(∂E/∂P)V

(∂V/∂T)P

4

# The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be

More

Less

Same

Data insufficient to predict

4

# Claude gas liquefaction process employs cooling

At constant pressure

By throttling

By expansion in an engine

None of these

4

2HI H2 + I2

N2O4 2NO2

2SO2 + O2 2SO3

None of these

4

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

Pressure

Composition

Temperature

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

4

Specific volume

Work

Pressure

Temperature

4

Isothermal

Isentropic

Isobaric

4

Less than

Same as

More than

Half

4

# The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is

Less

More

Same

Dependent on climatic conditions

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

# 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

# Equation which relates pressure, volume and temperature of a gas is called the

Equation of state

Gibbs Duhem equation

Ideal gas equation

None of these

4

Mass

Energy

Momentum

None of these

4

# In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is

More

Less

Same

Unpredictable; depends on the particular reaction

4

J/s

J.S

J/kmol

kmol/J

4

F = E - TS

F = H - TS

F = H + TS

F = E + TS

4

# The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation.

Van Laar

Margules

Gibbs-Duhem

Gibbs-Duhem-Margules

4

# In case of a close thermodynamic system, there is __________ across the boundaries.

No heat and mass transfer

No mass transfer but heat transfer

Mass and energy transfer

None of these

4

# For a given substance at a specified temperature, activity is __________ to fugacity.

Directly proportional

Inversely proportional

Equal

None of these

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

# The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

Less pronounced

More pronounced

Equal

Data insufficient, can't be predicted

4

2

0

1

3

4

# Activity co-efficient is a measure of the

Departure from ideal solution behaviour

Departure of gas phase from ideal gas law

Vapour pressure of liquid

None of these

4

# Which of the following is not affected by temperature changes?

Fugacity

Activity co-efficient

Free energy

None of these