4

The same

Less than

Greater than

Different than

A. The same

4

# In any spontaneous process, the __________ free energy decreases.

Helmholtz

Gibbs

Both a & b

Neither 'a' nor 'b'

4

PV

2PV

PV/2

0

4

# Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates

Use of only one graph for all gases

Covering of wide range

Easier plotting

More accurate plotting

4

# Pick out the wrong statement:

The expansion of a gas in vacuum is an irreversible process

An isometric process is a constant pressure process

Entropy change for a reversible adiabatic process is zero

Free energy change for a spontaneous process is negative

4

# Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will

Increase

Decrease

Remain unchanged

First fall and then rise

4

Specific volume

Temperature

Mass

Pressure

4

# Pick out the wrong statement.

The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction

With increase in temperature, the equilibrium constant increases for an exothermic reaction

The equilibrium constant of a reaction depends upon temperature only

The conversion for a gas phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction

4

# Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the

Two temperatures only

Pressure of working fluid

Mass of the working fluid

Mass and pressure both of the working fluid

4

Negative

Zero

Infinity

None of these

4

Saturated vapour

Solid

Gas

Liquid

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

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

State functions

Path functions

Intensive properties

Extensive properties

4

ds = 0

ds < 0

ds > 0

ds = Constant

4

# Pick out the wrong statement.

A closed system does not permit exchange of mass with its surroundings but may permit exchange of energy.

An open system permits exchange of both mass and energy with its surroundings

The term microstate is used to characterise an individual, whereas macro-state is used to designate a group of micro-states with common characteristics

None of the above

4

6738.9

6753.5

7058.3

9000

4

# Work done may be calculated by the expression ∫ p dA for __________ processes.

Non-flow reversible

Both (A) and (B)

Neither (A) nor (B)

4

# Standard temperature and pressure (S.T.P.) is

0°C and 750 mm Hg

15°C and 750 mm Hg

0°C and 1 kgf/cm2

15°C and 1 kgf/cm2

4

0

+ve

-ve

4

# In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants)

Addition of inert gas favours the forward reaction, when Δx is positive

Pressure has no effect on equilibrium, when Δn = 0

Addition of inert gas has no effect on the equilibrium constant at constant volume for any value of Δx (+ ve, - ve) or zero)

All 'a', 'b' & 'c'

4

30554

10373

4988.4

4364.9

4

# It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.

The amount of work needed is path dependent

Work alone cannot bring out such a change of state

The amount of work needed is independent of path

More information is needed to conclude anything about the path dependence or otherwise of the work needed

4

# Cp of a gas at its critical temperature and pressure

Becomes zero

Becomes infinity

Equals 1 kcal/kmol °K

Equals 0.24 kcal/kmol °K

4

4 J

0

8 J

4

Zero

Unity

Infinity

Negative

4

# For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.

Decreases

Increases

Remain same

Decreases linearly

4

Non-uniformly

Isobarically

Isothermally

4

# In any spontaneous process,

Only F decreases

Only A decreases

Both F and A decreases

Both F and A increase

4

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

Entropy

Gibbs free energy

Internal energy

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

4

# Chemical engineering thermodynamics is concerned with the __________ in/of chemical processes.

Reaction mechanism

Calculation of rates

Energy transformation from one form to another

None of these