4

# A gas shows deviation from ideal behaviour at

Low pressure and high temperature

Low pressure and low temperature

Low temperature and high pressure

High temperature and high pressure

C. Low temperature and high pressure

4

R loge 4

R log10 4

Cv log10 4

Cv loge 4

4

100,000 kW

160,000 kW

200,000 kW

320,000 kW

4

ds = 0

ds <0

ds > 0

ds = Constant

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

# For an exothermic reaction

Only enthalpy change (ΔH) is negative

Only internal energy change (ΔE) is negative

Both ΔH and ΔE are negative

Enthalpy change is zero

4

More than

Less than

Equal to

Not related to

4

The same

Less than

Greater than

Different than

4

SO2

NH3

CCl2F2

C2H4Cl2

4

# What happens in a reversible adiabatic compression?

Heating occurs

Cooling occurs

Pressure is constant

Temperature is constant

4

2HI H2 + I2

N2O4 2NO2

2SO2 + O2 2SO3

None of these

4

# Fugacity is most helpful in

Representing actual behaviour of real gases

Representing actual behaviour of ideal gases

The study of chemical equilibria involving gases at atmospheric pressure

None of these

4

# The adiabatic throttling process of a perfect gas is one of constant enthalpy

In which there is a temperature drop

Which is exemplified by a non-steady flow expansion

Which can be performed in a pipe with a constriction

In which there is an increase in temperature

4

Isobaric

Isothermal

None of these

4

-19.4

-30.2

55.2

-55.2

4

< 0

> 0

= 0

None of these

4

Stirling

Brayton

Rankine

Both (B) and (C)

4

# Critical solution temperature (or the consolute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which

A homogeneous solution (say of phenol water) is formed

Mutual solubility of the two liquids shows a decreasing trend

Two liquids are completely separated into two layers

None of these

4

# To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (ΔHV/R) (1/T1 - 1/T2) from the exact Clapeyron equation, it is assumed that the

Volume of the liquid phase is negligible compared to that of vapour phase

Vapour phase behaves as an ideal gas

Heat of vaporisation is independent of temperature

All (A), (B) & (C)

4

0

273

25

None of these

4

# During Joule-Thomson expansion of gases

Enthalpy remains constant

Entropy remains constant

Temperature remains constant

None of these

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

No

Any real

Only ideal

Both (B) and (C)

4

# Maxwell's relation corresponding to the identity, dH = dS = Vdp + Σμi dni is

(∂T/∂V)S, ni = -(∂P/∂S)V, ni

(∂S/∂P)T, ni = (∂V/∂T)P, ni

(∂S/∂V)T, ni = (∂P/∂T)V, ni

(∂T/∂P)S, ni = (∂V/∂S)P, ni

4

-94 kcal

+94 kcal

> 94 kcal

< -94 kcal

4

# When a gas is subjected to adiabatic expansion, it gets cooled due to

Decrease in velocity

Decrease in temperature

Decrease in kinetic energy

Energy spent in doing work

4

# As the time is passing, entropy of the universe

Is increasing

Is decreasing

Remain constant

Data insufficient, can't be predicted

4

# Which of the following will increase the volume of a real gas by four times?

Doubling the absolute temperature as well as pressure of the gas

Reducing pressure to one fourth at constant temperature

Reducing temperature to one fourth at constant pressure

Reducing the temperature to half and doubling the pressure

4

Bomb

Separating

Bucket

Throttling

4

# Requisites of a reversible process is that the

System and surroundings pressure be equal

Friction in the system should be absent

System and surroundings temperature be equal

None of these