4

# Ideal refrigeration cycle is

Same as Carnot cycle

Same as reverse Carnot cycle

Dependent on the refrigerant's properties

The least efficient of all refrigeration processes

B. Same as reverse Carnot cycle

4

# Gibbs-Helmholtz equation is

ΔF = ΔH + T [∂(ΔF)/∂T]P

ΔF = ΔH - TΔT

d(E - TS) T, V < 0

dP/dT = ΔHvap/T.ΔVvap

4

Entropy

Gibbs energy

Internal energy

Enthalpy

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

# Throttling process is a/an __________ process.

Reversible and isothermal

Irreversible and constant enthalpy

Reversible and constant entropy

Reversible and constant enthalpy

4

# Entropy of a substance remains constant during a/an __________ change.

Reversible isothermal

Irreversible isothermal

None of these

4

# To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (ΔHV/R) (1/T1 - 1/T2) from the exact Clapeyron equation, it is assumed that the

Volume of the liquid phase is negligible compared to that of vapour phase

Vapour phase behaves as an ideal gas

Heat of vaporisation is independent of temperature

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

4

Logarithmic

Arithmetic

Geometric

Harmonic

4

# When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is

Same in both the phases

Zero in both the phases

More in vapour phase

More in liquid phase

4

# An irreversible process

Is the analog of linear frictionless motion in machines

Is an idealised visualisation of behaviour of a system

Yields the maximum amount of work

Yields an amount of work less than that of a reversible process

4

Solution

Vaporisation

Formation

Sublimation

4

0

1

y = 1.44

1.66

4

# The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for

Expansion of a real gas

Reversible isothermal volume change

Heating of an ideal gas

Cooling of a real gas

4

# The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by

(R/ΔH) (1/T1 - 1/T2)

(ΔH/R) (1/T1 - 1/T2)

(ΔH/R) (1/T2 - 1/T1)

(1/R) (1/T1 - 1/T2)

4

# Rotary lime kiln is an example of a/an __________ system.

Closed

Open

Isolated

Non-thermodynamic

4

# The quantitative effect of temperature on chemical equilibrium is given by the

Vant-Hoff equation

Le-Chatelier's principle

Arrhenius equation

None of these

4

5 & 3

3.987 & 1.987

1.987 & 0.66

0.66 & 1.987

4

Isobaric

Isothermal

Isentropic

Isometric

4

0

> 0

< 0

None of these

4

Endothermic

Exothermic

Isothermal

4

# For an exothermic reaction

Only enthalpy change (ΔH) is negative

Only internal energy change (ΔE) is negative

Both ΔH and ΔE are negative

Enthalpy change is zero

4

RT ln K

-RT ln K

-R ln K

T ln K

4

Molecular size

Volume

Pressure

Temperature

4

# Entropy is a/an

State function

Macroscopic property

Extensive property

None of these

4

0

1

2

3

4

# Critical compressibility factor for all substances

Are more or less constant (vary from 0.2 to 0.3)

Vary as square of the absolute temperature

Vary as square of the absolute pressure

None of these

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

# The third law of thermodynamics states that the

Heat capacity of a crystalline solid is zero at absolute zero temperature

Heat transfer from low temperature to high temperature source is not possible without external work

Gases having same reduced properties behaves similarly

None of these

4

# High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:

Δ H = 0 and ΔS = 0

Δ H ≠ 0 and ΔS = 0

Δ H ≠ 0 and ΔS ≠ 0

Δ H = 0 and ΔS ≠ 0

4

# If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in

Volume

Enthalpy

Both (A) & (B)

Neither (A) nor (B)