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

C. 20°C and 760 mm Hg

4

# If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in

Volume

Enthalpy

Both (A) & (B)

Neither (A) nor (B)

4

# For a given substance at a specified temperature, activity is __________ to fugacity.

Directly proportional

Inversely proportional

Equal

None of these

4

# The equation relating E, P, V and T which is true for all substances under all conditions is given by (∂E/∂V)T = T(∂P/∂T)H - P. This equation is called the

Maxwell's equation

Thermodynamic equation of state

Equation of state

Redlich-Kwong equation of state

4

Zero

Unity

Infinity

Negative

4

Sub-cooled

Saturated

Non-solidifiable

None of these

4

# Entropy is a/an

State function

Macroscopic property

Extensive property

None of these

4

Solution

Formation

Dilution

Combustion

4

(dF)T, p <0

(dF)T, p = 0

(dF)T, p > 0

(dA)T, v >0

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

Lowest

Highest

Average

None of these

4

3

4

5

6

4

(∂E/∂T)V

(∂E/∂V)T

(∂E/∂P)V

(∂V/∂T)P

4

Tds = dE + dW

dE - dW = Tds

dW - dE = Tds

Tds - dW + dE >0

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

# Pick out the wrong statement.

Minimum number of degree of freedom of a system is zero

Degree of freedom of a system containing a gaseous mixture of helium, carbon dioxide and hydrogen is 4

For a two phase system in equilibrium made up of four non-reacting chemical species, the number of degrees of freedom is 4

Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation

4

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

Isothermal

Both (A) & (B)

Neither (A) nor (B)

4

# In an irreversible process

Tds = dE - dW = 0

dE - dW - Tds = 0

Tds - dE + dW < 0

Tds - dT + dW < 0

4

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

Increases

Decreases

Remains unchanged

May increase or decrease; depends on the substance

4

# Which of the following is not correct for a reversible adiabatic process?

TVγ-1 = constant

p1-γ.TY = constant

PVγ = constant

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

# As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine is

Not changed

Decreasing

Increasing

Data sufficient, can't be predicted

4

# It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.

The amount of work needed is path dependent

Work alone cannot bring out such a change of state

The amount of work needed is independent of path

More information is needed to conclude anything about the path dependence or otherwise of the work needed

4

# For the gaseous phase chemical reaction, C2H4(g) + H2O(g) ↔ C2H5OH(g), the equilibrium conversion does not depend on the

Steam to ethylene ratio

Temperature

Pressure

None of these

4

# The principle applied in liquefaction of gases is

Joule-Thomson effect

Both (A) and (B)

Neither (A) nor (B)

4

R loge 4

R log10 4

Cv log10 4

Cv loge 4

4

Path

Point

State

None of these

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

# Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor?

d ln p/dt = Hvap/RT2

d ln p/dt = RT2/Hvap

dp/dt = RT2/Hvap

dp/dt = Hvap/RT2

4

# Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 PCl3 + Cl2.Degree of dissociation of PCl5 will

Increase on addition of an inert gas at constant pressure

Decrease on increasing the pressure of the system

None of these