4

Solution

Formation

Dilution

Combustion

A. Solution

4

# If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the

Process must be isobaric

Temperature must decrease

Both (B) and (C)

4

# High __________ is an undesirable property for a good refrigerant.

Specific heat

Latent heat of vaporisation

Viscosity

Specific vapor volume

4

Logarithmic

Arithmetic

Geometric

Harmonic

4

# Which of the following has the minimum value of COP for a given refrigeration effect?

Reverse Carnot cycle

Ordinary vapour-compression cycle

Vapour-compression process with a reversible expansion engine

Air refrigeration cycle

4

# Claude gas liquefaction process employs cooling

At constant pressure

By throttling

By expansion in an engine

None of these

4

# Throttling process is a/an __________ process.

Reversible and isothermal

Irreversible and constant enthalpy

Reversible and constant entropy

Reversible and constant enthalpy

4

# Entropy is a/an

State function

Macroscopic property

Extensive property

None of these

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

R loge 4

R log10 4

Cv log10 4

Cv loge 4

4

+ve

0

-ve

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

4

# After throttling, gas temperature

Decreases

Increases

Remain same

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

4

Water

Ammonia

Freon

Brine

4

# The standard Gibbs free energy change of a reaction depends on the equilibrium

Pressure

Temperature

Composition

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

4

Zeroth

First

Second

Third

4

# The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the

Lewis-Randall rule

Statement of Van't Hoff Equation

Le-Chatelier's principle

None of these

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

# Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the

Calorific value

Heat of reaction

Heat of combustion

Heat of formation

4

# y = specific heat ratio of an ideal gas is equal to

Cp/Cv

Cp/(CP-R)

1 + (R/CV)

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

4

dE = CpdT

dE = CvdT

dQ = dE + pdV

dW = pdV

4

# Pick out the correct statement.

Compression ratio of an Otto engine is comparatively higher than a diesel engine

Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio

Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work produced per quantity of heat

Diesel engine normally operates at lower compression ratio than an Otto engine for an equal output of work

4

# Refrigeration cycle

Violates second law of thermodynamics

Involves transfer of heat from low temperature to high temperature

Both (A) and (B)

Neither (A) nor (B)

4

# Pick out the wrong statement.

A refrigeration cycle violates the second law of thermodynamics

Refrigeration cycle is normally represented by a temperature vs. entropy plot

In a refrigerator, work required decreases as the temperature of the refrigerator and the temperature at which heat is rejected increases

One ton of refrigeration is equivalent to the rate of heat absorption equal to 3.53 kW

4

Molecular size

Temperature

Volume

Pressure

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

Molecular size

Volume

Pressure

Temperature

4

0.25

0.5

0.75

1

4

# Which of the following is not an equation of state?

Bertholet equation

Clausius-Clapeyron equation

Beattie-Bridgeman equation

None of these

4

270

327

300

540