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

A. A homogeneous solution (say of phenol water) is formed

4

Mass

Momentum

Energy

None of these

4

Enthalpy

Entropy

Pressure

None of these

4

5 & 3

3.987 & 1.987

1.987 & 0.66

0.66 & 1.987

4

# Mollier diagram is a plot of

Temperature vs. enthalpy

Temperature vs. enthalpy

Entropy vs. enthalpy

Temperature vs. internal energy

4

# In the reaction, H2 +I2 2HI, addition of an inert gas will

Increase the partial pressure of H2

Increase the partial pressure of I2

Increase the total pressure and hence shift the equilibrium towards the right

Not affect the equilibrium conditions

4

# Van Laar equation deals with the activity coefficients in

Binary solutions

Ternary solutions

Azeotropic mixture only

None of these

4

0

1

< 1

> 1

4

Surface tension

Free energy

Specific heat

Refractive index

4

Zeroth

First

Second

Third

4

T2/(T1 - T2)

T1/(T1 - T2)

(T1 - T2)/T1

(T1 - T2)/T2

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

Two

One

Zero

Three

4

# The third law of thermodynamics states that the

Heat capacity of a crystalline solid is zero at absolute zero temperature

Heat transfer from low temperature to high temperature source is not possible without external work

Gases having same reduced properties behaves similarly

None of these

4

# Entropy of the system decreases, when

Snow melts into water

A gas expands spontaneously from high pressure to low pressure

Water is converted into ice

Both (B) & (C)

4

# In any spontaneous process,

Only F decreases

Only A decreases

Both F and A decreases

Both F and A increase

4

dE = CpdT

dE = CvdT

dQ = dE + pdV

dW = pdV

4

# Critical temperature is defined as the temperature above which a gas will

Not liquify (barring exceptions)

Immediately liquify

Never liquify however high the pressure may be

None of these

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

# Dry ice is

Moisture free ice

Solid helium

Solid carbon dioxide

None of these

4

Isolated

Closed

Open

None of these

4

Isothermal

Isobaric

Isometric

4

μ = (∂P/∂T)H

μ = (∂T/∂P)H

μ = (∂E/∂T)H

μ = (∂E/∂P)H

4

0

273

25

None of these

4

Hour

Day

Minute

Second

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

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

Isothermal

Both (A) & (B)

Neither (A) nor (B)

4

# In any spontaneous process, the __________ free energy decreases.

Helmholtz

Gibbs

Both a & b

Neither 'a' nor 'b'

4

1.572

1.9398

3.389

4.238