4

# The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.

Temperature

Pressure

Composition

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

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

4

5 & 3

3.987 & 1.987

1.987 & 0.66

0.66 & 1.987

4

# Air-refrigeration cycle

Is the most efficient of all refrigeration cycles

Has very low efficiency

Requires relatively large quantities of air to achieve a significant amount of refrigeration

Both (B) and (C)

4

Temperature

Pressure

Volume

Entropy

4

0

1

2

3

4

Minimum

Zero

Maximum

Indeterminate

4

# Pick out the wrong statement.

The values of (∂P/∂V)T and (∂2P/∂V2)T are zero for a real gas at its critical point

Heat transferred is equal to the change in the enthalpy of the system, for a constant pressure, non-flow, mechanically reversible process

Thermal efficiency of a Carnot engine depends upon the properties of the working fluid besides the source & sink temperatures

During a reversible adiabatic process, the entropy of a substance remains constant

4

-ve

0

+ve

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

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

Closed

Open

Isolated

Non-thermodynamic

4

-273

0

-78

5

4

# Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation.

Polar

Non-polar

Both (A) & (B)

Neither (A) nor (B)

4

Free energy

Entropy

Refractive index

None of these

4

# Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 PCl3 + Cl2.Degree of dissociation of PCl5 will

Increase on addition of an inert gas at constant pressure

Decrease on increasing the pressure of the system

None of these

4

Kelvin's

Antoines

Kirchoffs

None of these

4

dQ = dE + dW

dQ = dE - dW

dE = dQ + dW

dW = dQ + dE

4

# Chemical potential of ith component of a system is given by

μi = (∂F/∂ni)T, P, ni

μi = (∂A/∂ni)T, P, ni

μi = (∂F/∂ni)T, P

μi = (∂A/∂ni)T, P

4

Molecular size

Volume

Pressure

Temperature

4

Zeroth

First

Second

Third

4

λb/Tb

Tb/λb

√(λb/Tb)

√(Tb/λb)

4

# Gibbs-Duhem equation

States that n11 + n22 + ....njj = 0, for a system of definite composition at constant temperature and pressure

Applies only to binary systems

Finds no application in gas-liquid equilibria involved in distillation

None of these

4

# In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in

Enhanced COP

Decreased COP

No change in the value of COP

Increased or decreased COP; depending upon the type of refrigerant

4

0

Maximum

Minimum

4

SO2

NH3

CCl2F2

C2H4Cl2

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

# Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be

Same

Doubled

Halved

One fourth of its original value

4

Increase

Decrease

No change

None of these

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

ds = 0

ds < 0

ds > 0

ds = Constant

4

0

1

2

3