Mass Transfer MCQs

Only vapor phase follows Raoult’s law

Only liquid phase obeys Dalton’s law

Liquid phase obeys Dalton’s law and vapor phase obeys Raoult’s law

Vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law

0.25

2.5

1.25

0.0025

Increase

Decrease

Remain unaffected

Decrease or increase ; depends on the type of liquid

Ideal solutions

Real solutions

Mixture of water and alcohol

Non-ideal gases

0

1

∞

< 1

A solution of benzene, toluene and oxylene

35% solution of camphor in water

35% solution of NH₃ in water

A solution of polar organic compounds (not of homologs of a series)

Is of low volatility

Forms a low boiling azeotrope

Forms a high boiling azeotrope

Does not alter the relative volatility of the original components

Continuous

Batch

Semi-batch

Cooling (adiabatic)-cum-evaporation

In case of induced draft cooling tower, the fan is placed at the top of the tower

Effectiveness of forced draft cooling tower is reduced by the recirculation of the humid and hot discharged air

A natural draft cooling tower is recommended to be used, when the air humidity is low and air temperature is also low

Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature

Zero

Unity

Infinity

None of these