4

Isothermally

Isobarically

None of these

4

Oxygen

Nitrogen

Air

Hydrogen

4

Zero

Positive

Negative

None of these

4

# The standard Gibbs free energy change of a reaction depends on the equilibrium

Pressure

Temperature

Composition

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

4

# Heat pump

Accomplishes only space heating in winter

Accomplishes only space cooling in summer

Accomplishes both (A) and (B)

Works on Carnot cycle

4

# dW and dq are not the exact differential, because q and W are

State functions

Path functions

Intensive properties

Extensive properties

4

30554

10373

4988.4

4364.9

4

0

1

2

3

4

RT d ln P

RT d ln f

R d ln f

None of these

4

# What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.)?

TR/(T2 - TR) × (T1 - T2)/T1

TR/(T2 - TR) × T1/(T1 - T2)

TR/(T1 - TR) × (T1 - T2)/T1

None of these

4

# Mollier chart is a __________ plot.

Pressure vs. enthalpy

Pressure vs. volume

Enthalpy vs. entropy

Temperature vs. entropy

4

# The equilibrium constant for a chemical reaction at two different temperatures is given by

Kp2/Kp1 = - (ΔH/R) (1/T2 - 1/T1)

Kp2/Kp1 = (ΔH/R) (1/T2 - 1/T1)

Kp2/Kp1 = ΔH (1/T2 - 1/T1)

Kp2/Kp1 = - (1/R) (1/T2 - 1/T1)

4

# An isentropic process is carried out at constant

Volume

Pressure

Temperature

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

4

Minimum

Zero

Maximum

None of these

4

# In case of an __________ process, the temperature of the system increases.

Isothermal compression

Isothermal expansion

4

Momentum

Mass

Energy

None of these

4

# Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are

Always greater than one

Same at the same reduced temperature

Same at the same reduced pressure

Both (B) & (C)

4

349

651

667

1000

4

# Mollier diagram is a plot of

Temperature vs. enthalpy

Temperature vs. enthalpy

Entropy vs. enthalpy

Temperature vs. internal energy

4

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

Entropy

Gibbs free energy

Internal energy

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

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

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

Fugacity

Activity co-efficient

Free energy

None of these

4

4 J

0

8 J

4

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

Molar concentration

Temperature

Internal energy

None of these

4

# The energy of activation of exothermic reaction is

Zero

Negative

Very large compared to that for endothermic reaction

Not possible to predict

4

# The heat capacities for the ideal gas state depend upon the

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

4

Enthalpy

Pressure

Entropy

None of these

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

# In case of the decomposition of hydroiodic acid (2HI H2 + I2), addition of H2 (at equilibrium condition) will

Increase the partial pressure of I2

Decrease the partial pressure of HI

Diminish the degree of dissociation of HI

None of these

4

# The equation relating E, P, V and T which is true for all substances under all conditions is given by (∂E/∂V)T = T(∂P/∂T)H - P. This equation is called the

Maxwell's equation

Thermodynamic equation of state

Equation of state

Redlich-Kwong equation of state