4

# What happens in a reversible adiabatic compression?

Heating occurs

Cooling occurs

Pressure is constant

Temperature is constant

A. Heating occurs

4

# The activity of an ideal gas is numerically __________ its pressure.

More than

Less than

Equal to

Data insufficient, can't be predicted

4

# Fugacity of a component in an ideal gas mixture is equal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at constant pressure and temperature __________ as its mole fraction increases.

Decreases

Decreases exponentially

Increases

Remain constant

4

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

Increases

Decreases

Remains unchanged

May increase or decrease; depends on the substance

4

# Normal temperature and pressure (N.T.P.) corresponds to

0°C and 760 mm Hg

15°C and 760 mm Hg

20°C and 760 mm Hg

0°C and 1 kgf/cm2

4

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

Directly proportional

Inversely proportional

Equal

None of these

4

(dF)T, p < 0

(dF)T, p > 0

(dF)T, p = 0

(dA)T, v < 0

4

# The equilibrium constant for a chemical reaction at two different temperatures is given by

Kp2/Kp1 = - (ΔH/R) (1/T2 - 1/T1)

Kp2/Kp1 = (ΔH/R) (1/T2 - 1/T1)

Kp2/Kp1 = ΔH (1/T2 - 1/T1)

Kp2/Kp1 = - (1/R) (1/T2 - 1/T1)

4

(dF)T, p <0

(dF)T, p = 0

(dF)T, p > 0

(dA)T, v >0

4

# All gases above its inversion temperature, in a throttling process will show

A heating effect

No change in temperature

A cooling effect

Either (A) or (C)

4

Surface tension

Free energy

Specific heat

Refractive index

4

# A Carnot cycle consists of the following steps:

Two isothermal and two isentropic

Two isobaric and two isothermal

Two isochoric and two isobaric

Two isothermals and two isochoric

4

# Which of the following will increase the volume of a real gas by four times?

Doubling the absolute temperature as well as pressure of the gas

Reducing pressure to one fourth at constant temperature

Reducing temperature to one fourth at constant pressure

Reducing the temperature to half and doubling the pressure

4

0

+ve

-ve

4

100

50

205

200

4

# Which of the following is not correct for a reversible adiabatic process?

TVγ-1 = constant

p1-γ.TY = constant

PVγ = constant

None of these

4

# Which of the following is an extensive property of a system?

Heat capacity

Molal heat capacity

Pressure

Concentration

4

Freon-12

Ethylene

Ammonia

Carbon dioxide

4

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

0

< 0

> 0

A function of pressure

4

# The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.

Kinematic viscosity

Work

Temperature

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

# Which of the following exemplifies an adiabatic process?

Melting of ice

Condensation of alcohol vapor

Sudden bursting of a cycle tube

Evaporation of water

4

# Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants)

(atm)Δx, when Δx is negative

(atm)Δx, when Δx is positive

Dimensionless, when Δx = 0

(atm)Δx2, when Δx > 0

4

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

Entropy

Internal energy

Enthalpy

Gibbs free energy

4

Negative

Zero

Infinity

None of these

4

Non-uniformly

Isobarically

Isothermally

4

Isobaric

Isothermal

None of these

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

# Which of the following is true for Virial equation of state?

Virial co-efficients are universal constants

Virial co-efficients 'B' represents three body interactions

Virial co-efficients are function of temperature only

For some gases, Virial equations and ideal gas equations are the same

4

Specific volume

Temperature

Mass

Pressure