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

B. Solubility increases as temperature decreases

4

V/T = Constant

V ∝ 1/T

V ∝ 1/P

PV/T = Constant

4

# Ideal refrigeration cycle is

Same as Carnot cycle

Same as reverse Carnot cycle

Dependent on the refrigerant's properties

The least efficient of all refrigeration processes

4

# Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C and 5.2 atm).

Pressure must be kept below 5.2 atm

Temperature must be kept above - 57°C

Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C

Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively

4

0

2

1

3

4

# Air-refrigeration cycle

Is the most efficient of all refrigeration cycles

Has very low efficiency

Requires relatively large quantities of air to achieve a significant amount of refrigeration

Both (B) and (C)

4

# For an incompressible fluid, the __________ is a function of both pressure as well as temperature.

Internal energy

Enthalpy

Entropy

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

4

# Co-efficient of Performance (COP) of a refrigerator is the ratio of the

Work required to refrigeration obtained

Refrigeration obtained to the work required

Lower to higher temperature

Higher to lower temperature

4

# Pick out the wrong statement

Phase rule variables are intensive properties

Heat and work are both state function

The work done by expansion of a gas in vacuum is zero

CP and CV are state function

4

0

1

2

3

4

# y = specific heat ratio of an ideal gas is equal to

Cp/Cv

Cp/(CP-R)

1 + (R/CV)

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

4

0

1

2

3

4

+ve

0

-ve

4

349

651

667

1000

4

+ve

0

-ve

4

# The main feature of Carnot refrigeration cycle is that, it

Does not need the addition of external work for its functioning

Transfers heat from high temperature to low temperature

Accomplishes the reverse effect of the heat engine

None of these

4

# Pick out the wrong statement.

Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapour phases at its critical point

Entropy of a system decreases with the evolution of heat

Change of internal energy is negative for exothermic reactions

The eccentric factor for all materials is always more than one

4

# With increase in compression ratio, the efficiency of the otto engine

Increases

Decreases

Remain constant

Increases linearly

4

# A large iceberg melts at the base, but not at the top, because of the reason that

Ice at the base contains impurities which lowers its melting point

Due to the high pressure at the base, its melting point reduces

The iceberg remains in a warmer condition at the base

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

4

# The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the

Lewis-Randall rule

Statement of Van't Hoff Equation

Le-Chatelier's principle

None of these

4

# In any spontaneous process,

Only F decreases

Only A decreases

Both F and A decreases

Both F and A increase

4

# Equilibrium constant of a reaction varies with the

Initial concentration of the reactant

Pressure

Temperature

None of these

4

Isobaric

Isenthalpic

Both (B) & (C)

4

# Pick out the wrong statement.

The values of (∂P/∂V)T and (∂2P/∂V2)T are zero for a real gas at its critical point

Heat transferred is equal to the change in the enthalpy of the system, for a constant pressure, non-flow, mechanically reversible process

Thermal efficiency of a Carnot engine depends upon the properties of the working fluid besides the source & sink temperatures

During a reversible adiabatic process, the entropy of a substance remains constant

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

T1/(T1-T2)

T2/(T1-T2)

T1/T2

T2/R1

4

# Throttling process is a/an __________ process.

Reversible and isothermal

Irreversible and constant enthalpy

Reversible and constant entropy

Reversible and constant enthalpy

4

No

Any real

Only ideal

Both (B) and (C)

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

# Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is

Slower than Y

Faster than Y

Three times slower than Y

Three times faster than Y

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