4

0

1

2

3

A. 0

4

Temperature

Pressure

Volume

None of these

4

# Standard temperature and pressure (S.T.P.) is

0°C and 750 mm Hg

15°C and 750 mm Hg

0°C and 1 kgf/cm2

15°C and 1 kgf/cm2

4

# Cv for an ideal gas

Does not depend upon temperature

Is independent of pressure only

Is independent of volume only

Is independent of both pressure and volume

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

4

# Second law of thermodynamics is concerned with the

Amount of energy transferred

Direction of energy transfer

Irreversible processes only

Non-cyclic processes only

4

# Adiabatic compression of a saturated water vapour makes it

Supersaturated

Superheated

Both (A) and (B)

Neither (A) nor (B)

4

# Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance)?

Air cycle

Carnot cycle

Ordinary vapour compression cycle

Vapour compression with a reversible expansion engine

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

# Throttling process is a/an __________ process.

Reversible and isothermal

Irreversible and constant enthalpy

Reversible and constant entropy

Reversible and constant enthalpy

4

0.5

3.5

4.5

8.5

4

# Gibbs-Helmholtz equation is

ΔF = ΔH + T [∂(ΔF)/∂T]P

ΔF = ΔH - TΔT

d(E - TS) T, V < 0

dP/dT = ΔHvap/T.ΔVvap

4

# (1/V) (∂V/∂T)P is the mathematical expression

Joule-Thomson co-efficient

Specific heat at constant pressure (Cp)

co-efficient of thermal expansion

Specific heat at constant volume (CV)

4

# Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the

Low pressure and high temperature

Low pressure and low temperature

High pressure and low temperature

High pressure and high temperature

4

# Which of the following is not an intensive property?

Molar heat capacity

Internal energy

Viscosity

None of these

4

Temperature

Mass

Volume

Pressure

4

# Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates

Use of only one graph for all gases

Covering of wide range

Easier plotting

More accurate plotting

4

Zero

Positive

Negative

None of these

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

# The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation.

Van Laar

Margules

Gibbs-Duhem

Gibbs-Duhem-Margules

4

0

+ ve

- ve

4

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

Co-efficient of thermal expansion

Compressibility

None of these

4

< 0

> 0

= 0

None of these

4

# For a constant volume process __________ by the system is used only to increase the internal energy.

Heat absorbed

Work done

Both (A) & (B)

Neither (A) nor (B)

4

0

+ve

-ve

4

Sublimation

Fusion

Transition

Vaporisation

4

12 P1V1

6 P1 V1

3 P1V1

P1 V1

4

Isothermal

Isentropic

None of these

4

# At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero. This follows from the

Third law of thermodynamics

Second law of thermodynamics

Nernst heat theorem

Maxwell's relations

4

1

0

-ve