4

# The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

Less than

Equal to

More than

Either (B) or (C); depends on the type of alloy

A. Less than

4

# In an ideal solution, the activity of a component equals its

Mole fraction

Fugacity at the same temperature and pressure

Partial pressure

None of these

4

# Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are

Always greater than one

Same at the same reduced temperature

Same at the same reduced pressure

Both (B) & (C)

4

0

1

2

3

4

# For an exothermic reaction

Only enthalpy change (ΔH) is negative

Only internal energy change (ΔE) is negative

Both ΔH and ΔE are negative

Enthalpy change is zero

4

30554

10373

4988.4

4364.9

4

# Boyle's law for gases states that

P ∝ 1/V, when temperature is constant

P ∝ 1/V, when temperature & mass of the gas remain constant

P ∝ V, at constant temperature & mass of the gas

P/V = constant, for any gas

4

RT ln K

-RT ln K

-R ln K

T ln K

4

# When pressure is applied on the system, ice ↔ water, then

Equilibrium cannot be established

More ice will be formed

More water will be formed

Evaporation of water will take place

4

0°C

273°C

100°C

-273°C

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

# The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for

Reversible isothermal volume change

Heating of a substance

Cooling of a substance

Simultaneous heating and expansion of an ideal gas

4

# Free energy

Decreases in all spontaneous (or irreversible) processes

Change during a spontaneous process has a negative value

Remains unchanged in reversible processes carried at constant temperature and pressure

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

4

dE = Tds - PdV

dQ = CvdT + PdV

dQ = CpdT + Vdp

Tds = dE - PdV

4

0.15

1.5

4.5

6.5

4

# Linde gas liquefaction process employs cooling

By throttling

By expansion in an engine

At constant pressure

None of these

4

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

Zero

+ve

-ve

Dependent on the path

4

# Mollier diagram is a plot of

Temperature vs. enthalpy

Temperature vs. enthalpy

Entropy vs. enthalpy

Temperature vs. internal energy

4

# The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

Less pronounced

More pronounced

Equal

Data insufficient, can't be predicted

4

# Chemical potential is a/an

Extensive property

Intensive property

Force which drives the chemical system to equilibrium

Both (B) and (C)

4

Increase

Decrease

No change

None of these

4

3

2

1

0

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

# 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

# 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

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

Directly proportional

Inversely proportional

Equal

None of these

4

Cv.dT

Cp.dT

∫ Cp.dT

∫ Cv.dT

4

# Internal energy of an ideal gas

Increases with increase in pressure

Decreases with increase in temperature

Is independent of temperature

None of these

4

# A gas can be liquefied by pressure alone only, when its temperature is __________ its critical temperature.

Less than

More than

Equal to or higher than

Less than or equal to

4

# For an isothermal process, the internal energy of a gas

Increases

Decreases

Remains unchanged

Data insufficient, can't be predicted