4

# With increase in temperature, the internal energy of a substance

Increases

Decreases

Remains unchanged

May increase or decrease; depends on the substance

A. Increases

4

# For an ideal liquid solution, which of the following is unity?

Activity

Fugacity

Activity co-efficient

Fugacity co-efficient

4

# At the critical point of a substance

The surface tension vanishes

Liquid and vapour have the same density

There is no distinction between liquid and vapour phases

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

4

50 kcal/hr

200 BTU/hr

200 BTU/minute

200 BTU/day

4

# The intensive properties are

Molar volume, density, viscosity and boiling point

Refractive index and surface tension

Both (A) and (B)

None of these

4

# (∂H/∂T)P is the mathematical expression for

CV

Entropy change

Gibbs free energy

None of these

4

2

0

1

3

4

-94 kcal

+94 kcal

> 94 kcal

< -94 kcal

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

First law

Zeroth law

Third law

Second law

4

# Clausius-Clapeyron Equation gives accurate result, when the

Vapour pressure is relatively low and the temperature does not vary over wide limits

Vapour obeys the ideal gas law and the latent heat of vaporisation is constant

Volume in the liquid state is negligible compared with that in the vapour state

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

4

# As the time is passing, entropy of the universe

Is increasing

Is decreasing

Remain constant

Data insufficient, can't be predicted

4

Endothermic

Exothermic

Isothermal

4

# Internal energy change of a system over one complete cycle in a cyclic process is

Zero

+ve

-ve

Dependent on the path

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

CO2

H2

O2

N2

4

Zeroth

First

Second

Third

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

# The internal energy of a gas obeying P (V - b) RT (where, b is a positive constant and has a constant Cv), depends upon its

Pressure

Volume

Temperature

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

4

0

1

2

3

4

Isothermal

Isobaric

Isochoric

4

# Cp - Cv = R is valid for __________ gases.

Ideal

Very high pressure

Very low temperature

All of the above

4

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

Entropy

Gibbs free energy

Internal energy

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

4

Surface tension

Free energy

Specific heat

Refractive index

4

Cp < Cv

Cp = Cv

Cp > Cv

C ≥ Cv

4

ds = 0

ds <0

ds > 0

ds = Constant

4

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

Directly proportional

Inversely proportional

Equal

None of these

4

Bomb

Separating

Bucket

Throttling

4

2HI H2 + I2

N2O4 2NO2

2SO2 + O2 2SO3

None of these

4

# Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O CO2 + H2, by

Low temperature and high pressure

Low temperature and low pressure

High temperature and high pressure

High temperature and low pressure

4

# A solid is transformed into vapour without going to the liquid phase at

Triple point

Boiling point

Below triple point

Always