4

Entropy

Gibbs energy

Internal energy

Enthalpy

B. Gibbs energy

4

# Which of the following equations is used for the prediction of activity co-efficient from experiments?

Van Laar equation

Margules equation

Wilson's equation

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

4

# When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the

Le-Chatelier principle

Kopp's rule

Law of corresponding state

Arrhenius hypothesis

4

Isothermal

Isentropic

None of these

4

Mass

Momentum

Energy

None of these

4

-273

0

-78

5

4

n = y = 1.4

n = 0

n = 1

n = 1.66

4

1

2

3

0

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

# Joule-Thomson co-efficient depends on the

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

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

# Adiabatic compression of a saturated water vapour makes it

Supersaturated

Superheated

Both (A) and (B)

Neither (A) nor (B)

4

# Equilibrium constant decreases as the temperature

Increases, for an exothermic reaction

Decreases, for an exothermic reaction

Increases, for an endothermic reaction

None of these

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

# 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

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

Heat capacity

Molal heat capacity

Pressure

Concentration

4

CO2

H2

O2

N2

4

30554

10373

4988.4

4364.9

4

Pressure

Solubility

Temperature

None of these

4

# __________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low.

Bucket

Throttling

Separating

A combination of separating & throttling

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

0

1

None of these

4

Equilibrium

4

Heat pump

Heat engine

Carnot engine

None of these

4

# If an ideal solution is formed by mixing two pure liquids in any proportion, then the __________ of mixing is zero

Enthalpy

Volume

Both 'a' & 'b'

Neither 'a' nor 'b'

4

Free energy

Entropy

Refractive index

None of these

4

Eutectic

Triple

Plait

Critical

4

# For a cyclic process, a fixed ratio between heat and work

Always exists

May exist

Never exists

Is difficult to predict

4

Water

Air

Evaporative

Gas

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