4

Freezing

Triple

Boiling

Boyle

B. Triple

4

# __________ increases with increase in pressure.

The melting point of wax

The boiling point of a liquid

Both (A) and (B)

Neither (A) nor (B)

4

# Pick out the correct statement.

If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase

A process is irreversible as long as Δ S for the system is greater than zero

The mechanical work done by a system is always equal to∫P.dV

The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

4

# The expression for entropy change, ΔS = n Cp . ln (T2/T1), is valid for the __________ of a substance.

Simultaneous pressure & temperature change

Heating

Cooling

Both (B) and (C)

4

# During Joule-Thomson expansion of gases

Enthalpy remains constant

Entropy remains constant

Temperature remains constant

None of these

4

Isothermal

Isentropic

Polytropic

4

# The total change in the enthalpy of a system is independent of the

Number of intermediate chemical reactions involved

Pressure and temperature

State of combination and aggregation in the beginning and at the end of the reaction

None of these

4

# Van Laar equation deals with the activity coefficients in

Binary solutions

Ternary solutions

Azeotropic mixture only

None of these

4

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

Heat capacity

Molal heat capacity

Pressure

Concentration

4

# Fugacity and pressure are numerically equal, when the gas is

In standard state

At high pressure

At low temperature

In ideal state

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

# After throttling, gas temperature

Decreases

Increases

Remain same

May increase or decrease; depends on the nature of the gas

4

# For a spontaneous process, free energy

Is zero

Increases

Decreases whereas the entropy increases

And entropy both decrease

4

# In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, the Carnot COP will be

5.2

6.2

0.168

Data insufficient, can't be found out

4

Entropy

Temperature

Enthalpy

Pressure

4

# Entropy of the system decreases, when

Snow melts into water

A gas expands spontaneously from high pressure to low pressure

Water is converted into ice

Both (B) & (C)

4

2HI H2 + I2

N2O4 2NO2

2SO2 + O2 2SO3

None of these

4

# Which of the following is an undesirable characteristic of a refrigerant?

It should be non-explosive

It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

Its vapor pressure at the condenser temperature should be very high

None of these

4

# A solute distributes itself between two nonmiscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount. This is

The distribution law

Followed from Margules equation

A corollary of Henry's law

None of these

4

# __________ explains the equilibrium constant for any chemical reaction.

Henry's law

Law of mass action

Hess's law

None of these

4

# Clausius-Clapeyron Equation gives accurate result, when the

Vapour pressure is relatively low and the temperature does not vary over wide limits

Vapour obeys the ideal gas law and the latent heat of vaporisation is constant

Volume in the liquid state is negligible compared with that in the vapour state

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

4

# Which of the following decreases with increase in pressure?

Melting point of ice

Melting point of wax

Boiling point of liquids

None of these

4

# Entropy of an ideal gas depends upon its

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

4

# Kopp's rule is used to calculate the heat capacity of

Solids

Liquids

Gases

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

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

# Pick out the wrong statement.

Minimum number of degree of freedom of a system is zero

Degree of freedom of a system containing a gaseous mixture of helium, carbon dioxide and hydrogen is 4

For a two phase system in equilibrium made up of four non-reacting chemical species, the number of degrees of freedom is 4

Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation

4

# The expression, nCv(T2 - T1), is for the __________ of an ideal gas.

Co-efficient of thermal expansion

Compressibility

None of these

4

Minimum

Zero

Maximum

None of these

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

# 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