4

# Pick out the correct statement.

Entropy and enthalpy are path functions

In a closed system, the energy can be exchanged with the surrounding, while matter cannot be exchanged

All the natural processes are reversible in nature

Work is a state function

C. All the natural processes are reversible in nature

4

Critical

Boyle

Inversion

Reduced

4

Isothermally

Isobarically

None of these

4

Isothermal

Irreversible

Reversible

4

Water

Air

Evaporative

Gas

4

# Heat pump

Accomplishes only space heating in winter

Accomplishes only space cooling in summer

Accomplishes both (A) and (B)

Works on Carnot cycle

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

# The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition.

Internal energy

Enthalpy

Gibbs free energy

Helmholtz free energy

4

CO2

H2

O2

N2

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

# The quantitative effect of temperature on chemical equilibrium is given by the

Vant-Hoff equation

Le-Chatelier's principle

Arrhenius equation

None of these

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

# Adiabatic compression of a saturated water vapour makes it

Supersaturated

Superheated

Both (A) and (B)

Neither (A) nor (B)

4

# Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ____with the increase of reduced temperature.

Decreases

Increases

Remains constant

Decreases logarithmically

4

# Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor)?

Freon

Liquid sulphur dioxide

Methyl chloride

Ammonia

4

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

In standard state

At high pressure

At low temperature

In ideal state

4

A . x22

Ax1

Ax2

Ax12

4

# A change in state involving a decrease in entropy can be spontaneous, only if

It is exothermic

It is isenthalpic

It takes place isothermally

It takes place at constant volume

4

# Gibbs-Duhem equation relates composition in liquid phase and the __________ at constant temperature & pressure.

Fugacity

Partial pressure

Activity co-efficient

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

4

# Cp - Cv = R is valid for __________ gases.

Ideal

Very high pressure

Very low temperature

All of the above

4

T

T and P

T, P and Z

T and Z

4

0.5

3.5

4.5

8.5

4

Hour

Day

Minute

Second

4

2HI H2 + I2

N2O4 2NO2

2SO2 + O2 2SO3

None of these

4

Pressure

Solubility

Temperature

None of these

4

# Linde gas liquefaction process employs cooling

By throttling

By expansion in an engine

At constant pressure

None of these

4

Cp < Cv

Cp = Cv

Cp > Cv

C ≥ Cv

4

# The most important application of distribution law is in

Evaporation

Liquid extraction

Drying

Distillation

4

0

< 0

> 0

4

# In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is

More

Less

Same

Unpredictable; depends on the particular reaction