4

2.73

28.3

273

283

B. 28.3

4

# When a gas is subjected to adiabatic expansion, it gets cooled due to

Decrease in velocity

Decrease in temperature

Decrease in kinetic energy

Energy spent in doing work

4

# The internal energy of an incompressible fluid depends upon its

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

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

Isolated

Open

Insulated

Closed

4

Isothermal

Isometric

None of these

4

Molecular size

Volume

Pressure

Temperature

4

λb/Tb

Tb/λb

√(λb/Tb)

√(Tb/λb)

4

# Pick out the wrong statement.

System (of partially miscible liquid pairs), in which the mutual solubility increases with rise in temperature, are said to possess an upper consolute temperature

Systems, in which the mutual solubility increases with decrease in temperature, are said to possess lower consolute temperature

Nicotine-water system shows both an upper as well as a lower consolute temperature, implying that they are partially miscible between these two limiting temperatures

None of these

4

# First law of thermodynamics deals with the

Direction of energy transfer

Reversible processes only

Irreversible processes only

None of these

4

# Which is not constant for an ideal gas?

(∂P/∂V)T

(∂V/∂T)P

(∂P/∂V)V

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

4

# The second law of thermodynamics states that

The energy change of a system undergoing any reversible process is zero

It is not possible to transfer heat from a lower temperature to a higher temperature

The total energy of system and surrounding remains the same

None of the above

4

# The expression, ΔG = nRT. ln(P2/P1), gives the free energy change

With pressure changes at constant temperature

Under reversible isothermal volume change

During heating of an ideal gas

During cooling of an ideal gas

4

# Pick out the undesirable property for a good refrigerant.

High thermal conductivity

Low freezing point

Large latent heat of vaporisation

High viscosity

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

Zero

One

Two

Three

4

# Pick out the wrong statement.

At constant pressure, solubility of a gas in a liquid diminishes with rise in temperature

Normally, the gases which are easily liquefied are more soluble in common solvents

The gases which are capable of forming ions in aqueous solution are much more soluble in water than in other solvents

At constant pressure, solubility of a gas in a liquid increases with rise in temperature

4

# Chemical potential is a/an

Extensive property

Intensive property

Force which drives the chemical system to equilibrium

Both (B) and (C)

4

1st

Zeroth

3rd

None of these

4

# Claude gas liquefaction process employs cooling

At constant pressure

By throttling

By expansion in an engine

None of these

4

0

1

2

3

4

F = E - TS

F = H - TS

F = H + TS

F = E + TS

4

4 J

0

8 J

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

+ve

0

-ve

4

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

Reversible and isothermal

Isothermal and irreversible

4

# If we increase the pressure on a substance (which is at its triple point), then the triple point

Increases

Decreases

Remains unchanged

May increase or decrease; depends on the substance

4

# Equilibrium constant of a reaction varies with the

Initial concentration of the reactant

Pressure

Temperature

None of these

4

Water

Air

Evaporative

Gas

4

Endothermic

Exothermic

Isothermal