4

# Boiling of liquid is accompanied with increase in the

Vapor pressure

Specific Gibbs free energy

Specific entropy

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

A. Vapor pressure

4

# A refrigeration cycle is the same as a __________ cycle,

Turbine

Heat engine

Reversed heat engine

None of these

4

Surface tension

Free energy

Specific heat

Refractive index

4

# A reasonably general expression for vapourliquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yi is the liquid activity co-efficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of

Temperature only

Temperature and pressure only

Temperature, pressure and liquid composition xi only

Temperature, pressure, liquid composition xi and vapour composition yi

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

Two

One

Zero

Three

4

< 0

> 0

= 0

None of these

4

# In case of the decomposition of hydroiodic acid (2HI H2 + I2), addition of H2 (at equilibrium condition) will

Increase the partial pressure of I2

Decrease the partial pressure of HI

Diminish the degree of dissociation of HI

None of these

4

0

+ ve

- ve

4

Zeroth

First

Second

Third

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

Molten sodium

Mercury

Molten potassium

4

P + F - C = 2

C = P - F + 2

F = C - P - 2

P = F - C - 2

4

# Work done in an adiabatic process between two states depends on the

Rate of heat transmission

Initial state only

End states only

None of these

4

# For multi-component multiple phases to be in equilibrium at the same pressure and temperature, the __________ of each component must be same in all phases.

Chemical potential

Fugacity

Both (A) and (B)

Neither (A) nor (B)

4

# Fugacity co-efficient of a substance is the ratio of its fugacity to

Mole fraction

Activity

Pressure

Activity co-efficient

4

# Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).

Entropy

Internal energy

Enthalpy

Gibbs free energy

4

0

+ve

-ve

4

# At a given temperature, the volume of a gas dissolved in a solvent __________ with increase in pressure.

Increases

Decreases

Remains unchanged

May increase or decrease; depends on the gas

4

# Heat of formation of an element in its standard state is

0

< 0

> 0

A function of pressure

4

# As the time is passing, entropy of the universe

Is increasing

Is decreasing

Remain constant

Data insufficient, can't be predicted

4

# Fugacity is a measure of the

Escaping tendencies of the same substance in different phases of a system

Relative volatility of a mixture of two miscible liquids

Behaviour of ideal gases

None of these

4

# The thermodynamic law, PVy = constant, is not applicable in case of

Ideal compression of air

Free expansion of an ideal gas

Adiabatic expansion of steam in a turbine

Adiabatic compression of a perfect gas

4

# On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/ ∂V)T are related as (where, y = Cp/Cv)

(∂P/∂V)S = (∂P/∂V)T

(∂P/∂V)S = [(∂P/∂V)T]Y

(∂P/∂V)S = y(∂P/∂V)T

(∂P/∂V)S = 1/y(∂P/∂V)T

4

Fusion

Vaporisation

Transition

None of these

4

# At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be

More

Less

Same

More or less; depending on the system

4

He

N2

O2

H2

4

Isobaric

Isenthalpic

Both (B) & (C)

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

# In the reaction, H2 +I2 2HI, addition of an inert gas will

Increase the partial pressure of H2

Increase the partial pressure of I2

Increase the total pressure and hence shift the equilibrium towards the right

Not affect the equilibrium conditions