4

# Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be

580

640

1160

Data insufficient; can't be computed

C. 1160

4

# In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in

Enhanced COP

Decreased COP

No change in the value of COP

Increased or decreased COP; depending upon the type of refrigerant

4

# The unit of fugacity is the same as that of the

Pressure

Temperature

Volume

Molar concentration

4

# The unit of equilibrium constant of a chemical reaction is the same as that of

Molar concentration

Temperature

Internal energy

None of these

4

# For an ideal gas, the enthalpy

Increases with rise in pressure

Decreases with rise in pressure

Is independent of pressure

Is a path function

4

# With increase in compression ratio, the efficiency of the otto engine

Increases

Decreases

Remain constant

Increases linearly

4

No

Any real

Only ideal

Both (B) and (C)

4

# Gibbs free energy (G) is represented by, G = H - TS, whereas Helmholtz free energy, (A) is given by, A = E - TS. Which of the following is the Gibbs-Helmholtz equation?

[∂(G/T)/∂T] = - (H/T2)

[∂(A/T)/∂T]V = - E/T2

Both (A) and (B)

Neither (A) nor (B)

4

# Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in

Increased COP

Same COP

Decreased COP

Increased or decreased COP; depending upon the type of refrigerant

4

Concentration

Mass

Temperature

Entropy

4

# The energy of activation of exothermic reaction is

Zero

Negative

Very large compared to that for endothermic reaction

Not possible to predict

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

1st

Zeroth

3rd

None of these

4

Isothermally

Isobarically

None of these

4

0

+ ve

- ve

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

1

2

3

4

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

dE = CpdT

dE = CvdT

dQ = dE + pdV

dW = pdV

4

# The equation, PV = nRT, is best obeyed by gases at

Low pressure & high temperature

High pressure & low temperature

Low pressure & low temperature

None of these

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

# In Joule-Thomson porous plug experiment, the

Enthalpy does not remain constant

Entire apparatus is exposed to surroundings

Temperature remains constant

None of these

4

# Which is an example of closed system?

Air compressor

Liquid cooling system of an automobile

Boiler

None of these

4

# dW and dq are not the exact differential, because q and W are

State functions

Path functions

Intensive properties

Extensive properties

4

Less than

Same as

More than

Half

4

# Adiabatic compression of a saturated water vapour makes it

Supersaturated

Superheated

Both (A) and (B)

Neither (A) nor (B)

4

# Melting of ice exemplifies a/an

Endothermic reaction

Exothermic reaction

Process involving a chemical reaction

4

T1/(T1-T2)

T2/(T1-T2)

T1/T2

T2/R1

4

Reversible

Isothermal

None of these

4

0

50

100