4

# The equation Tds = dE - PdV applies to

Single phase fluid of varying composition

Single phase fluid of constant composition

Open as well as closed systems

Both (B) and (C)

D. Both (B) and (C)

4

# The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while freezing.

Contracts

Expands

Does not change in volume

Either (A), (B) or (C)

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

# __________ 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.

The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction

With increase in temperature, the equilibrium constant increases for an exothermic reaction

The equilibrium constant of a reaction depends upon temperature only

The conversion for a gas phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction

4

# With increase in temperature, the internal energy of a substance

Increases

Decreases

Remains unchanged

May increase or decrease; depends on the substance

4

# Chemical potential of ith component of a system is given by

μi = (∂F/∂ni)T, P, ni

μi = (∂A/∂ni)T, P, ni

μi = (∂F/∂ni)T, P

μi = (∂A/∂ni)T, P

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

0

< 0

< 1

> 1

4

Positive

Negative

Zero

Infinity

4

Zeroth

First

Second

Third

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

# The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by

(∂E/∂ni)S, v, nj

(∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj

(∂H/∂ni)S, P, nj

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

4

Isothermal

Isentropic

None of these

4

# For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.

Decreases

Increases

Remain same

Decreases linearly

4

0.5

3.5

4.5

8.5

4

# As the time is passing, entropy of the universe

Is increasing

Is decreasing

Remain constant

Data insufficient, can't be predicted

4

0.25

0.5

0.75

1

4

# The gas law (PV = RT) is true for an __________ change.

Isothermal

Both (A) & (B)

Neither (A) nor (B)

4

1

2

3

4

4

# Which of the following identities can be most easily used to verify steam table data for superheated steam?

(∂T/∂V)S = (∂p/∂S)V

(∂T/∂P)S = (∂V/∂S)P

(∂P/∂T)V = (∂S/∂V)T

(∂V/∂T)P = -(∂S/∂P)T

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

# The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for

Reversible isothermal volume change

Heating of a substance

Cooling of a substance

Simultaneous heating and expansion of an ideal gas

4

# The heat capacities for the ideal gas state depend upon the

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

4

# A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system

its internal energy (U) decreases and its entropy (S) increases

U and S both decreases

U decreases but S is constant

U is constant but S decreases

4

Volume

Pressure

Temperature

All a, b & c

4

# A solute distributes itself between two nonmiscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount. This is

The distribution law

Followed from Margules equation

A corollary of Henry's law

None of these

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

# With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure

Increases

Decreases

Remain same

Decreases linearly

4

CO2

H2

O2

N2