4

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

Mole fraction

Activity

Pressure

Activity co-efficient

C. Pressure

4

Zeroth

First

Second

Third

4

Molecular size

Volume

Pressure

Temperature

4

Surface tension

Free energy

Specific heat

Refractive index

4

Cp < Cv

Cp = Cv

Cp > Cv

C ≥ Cv

4

(∂E/∂T)V

(∂E/∂V)T

(∂E/∂P)V

(∂V/∂T)P

4

A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

Vapor compression cycle using expansion valve

Air refrigeration cycle

Vapor compression cycle using expansion engine

Carnot refrigeration cycle

4

The equation relating E, P, V and T which is true for all substances under all conditions is given by (∂E/∂V)T = T(∂P/∂T)H - P. This equation is called the

Maxwell's equation

Thermodynamic equation of state

Equation of state

Redlich-Kwong equation of state

4

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

Chemical potential

Activity

Fugacity

Activity co-efficient

4

The equation Tds = dE - PdV applies to

Single phase fluid of varying composition

Single phase fluid of constant composition

Open as well as closed systems

Both (B) and (C)

4

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

Directly proportional

Inversely proportional

Equal

None of these

4

Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ____with the increase of reduced temperature.

Decreases

Increases

Remains constant

Decreases logarithmically

4

The value of gas constant 'R' is

1.987 cal/gm mole °K

1.987 BTU/lb. mole °R

Both (A) and (B)

Neither (A) nor (B)

4

Isolated

Open

Insulated

Closed

4

Which of the following equations is used for the prediction of activity co-efficient from experiments?

Van Laar equation

Margules equation

Wilson's equation

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

4

First law

Zeroth law

Third law

Second law

4

Gibbs-Helmholtz equation is

ΔF = ΔH + T [∂(ΔF)/∂T]P

ΔF = ΔH - TΔT

d(E - TS) T, V < 0

dP/dT = ΔHvap/T.ΔVvap

4

Fugacity and pressure are numerically not equal for the gases

At low temperature and high pressure

At standard state

Both (A) and (B)

In ideal state

4

Mass

Momentum

Energy

None of these

4

PVy = constant, holds good for an isentropic process, which is

Reversible and isothermal

Isothermal and irreversible

4

0

1

2

3

4

The work done in isothermal compression compared to that in adiabatic compression will be

Less

More

Same

More or less depending upon the extent of work done

4

If two gases have same reduced temperature and reduced pressure, then they will have the same

Volume

Mass

Critical temperature

None of these

4

Enthalpy changes over a constant pressure path are always zero for __________ gas.

Any

A perfect

An easily liquefiable

A real

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

Van Laar equation deals with the activity coefficients in

Binary solutions

Ternary solutions

Azeotropic mixture only

None of these

4

If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as

Solubility increases as temperature increases

Solubility increases as temperature decreases

Solubility is independent of temperature

Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution

4

349

651

667

1000

4

__________ explains the equilibrium constant for any chemical reaction.

Henry's law

Law of mass action

Hess's law

None of these

4

The standard state of a gas (at a given temperature) is the state in which fugacity is equal to

Unity

Activity

Both (A) & (B)

Neither (A) nor (B)