4

Solution

Vaporisation

Formation

Sublimation

B. Vaporisation

4

Hour

Day

Minute

Second

4

# Partial molar free energy of an element A in solution is same as its

Chemical potential

Activity

Fugacity

Activity co-efficient

4

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

State functions

Path functions

Intensive properties

Extensive properties

4

# The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while freezing.

Contracts

Expands

Does not change in volume

Either (A), (B) or (C)

4

Ideal

Real

Isotonic

None of these

4

Pressure

Solubility

Temperature

None of these

4

# Which of the following is not an equation of state?

Bertholet equation

Clausius-Clapeyron equation

Beattie-Bridgeman equation

None of these

4

Endothermic

Exothermic

Isothermal

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

λb/Tb

Tb/λb

√(λb/Tb)

√(Tb/λb)

4

# Third law of thermodynamics is helpful in

Prediction of the extent of a chemical reaction

Calculating absolute entropies of substances at different temperature

Evaluating entropy changes of chemical reaction

Both (B) and (C)

4

# Which of the following processes cannot be made reversible even under ideal condition of operation?

Free expansion of a gas

Compression of air in a compressor

Expansion of steam in a turbine

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

4

Zeroth

First

Second

Third

4

# Internal energy of an ideal gas

Increases with increase in pressure

Decreases with increase in temperature

Is independent of temperature

None of these

4

# Equilibrium constant decreases as the temperature

Increases, for an exothermic reaction

Decreases, for an exothermic reaction

Increases, for an endothermic reaction

None of these

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

Temperature

Pressure

Volume

None of these

4

# When a gas is subjected to adiabatic expansion, it gets cooled due to

Decrease in velocity

Decrease in temperature

Decrease in kinetic energy

Energy spent in doing work

4

# A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres.

448

224

22.4

Data insufficient; can't be computed

4

# Linde gas liquefaction process employs cooling

By throttling

By expansion in an engine

At constant pressure

None of these

4

# For an incompressible fluid, the __________ is a function of both pressure as well as temperature.

Internal energy

Enthalpy

Entropy

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

4

# On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will

Increase

Decrease

Remain same

Increase in summer and will decrease in winter

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

# When dilute aqueous solutions of two salts are mixed, the process is associated with

Decrease in temperature

Increase in temperature

No change in temperature

Change in temperature which is a function of composition

4

# A solute distributes itself between two nonmiscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount. This is

The distribution law

Followed from Margules equation

A corollary of Henry's law

None of these

4

J/s

J.S

J/kmol

kmol/J

4

# When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is

More in vapour phase

More in liquid phase

Same in both the phases

Replaced by chemical potential which is more in vapour phase

4

# Pick out the correct statement.

Entropy and enthalpy are path functions

In a closed system, the energy can be exchanged with the surrounding, while matter cannot be exchanged

All the natural processes are reversible in nature

Work is a state function

4

Isothermally

Isobarically

None of these