GATE CH 2024 Paper 1 — page 14

Questions 40–42 of 65. Imported answers require review unless explicitly marked reviewed.

A gas stream containing 95 mol% CO

and 5 mol% ethanol is to be scrubbed with pure water in a counter-current, isothermal absorption column to remove ethanol. The desired composition of ethanol in the exit gas stream is 0.5 mol%. The equilibrium mole fraction of ethanol in the gas phase,

, is related to that in the liquid phase,

, as

. Assume CO

is insoluble in water and neglect evaporation of water. If the water flow rate is twice the minimum, the mole fraction of ethanol in the spent water is

Your answerChoose one option.

0.0225

0.0126

0.0428

0.0316

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Sulfur dioxide (SO

) gas diffuses through a stagnant air-film of thickness 2 mm at 1 bar and 30 °C. The diffusion coefficient of SO

in air is

. The SO

partial pressures at the opposite sides of the film are 0.15 bar and 0.05 bar. The universal gas constant is 8.314 J mol

. Assume ideal gas behavior, the steady-state flux of SO

in mol m

through the air-film is

Your answerChoose one option.

0.077

0.022

0.085

0.057

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A simple distillation column separates a binary mixture of

and

. The relative volatility of

with respect to

is 2. The steady-state composition of

in the vapour leaving the 1

, 2

and 3

trays in the rectifying section are 94, 90 and 85 mol%, respectively. For ideal trays and constant molar overflow, the reflux-to-distillate ratio is

Your answerChoose one option.

1.9

2.7

1.2

1.1

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2024 · Paper 1

Question 40

Question 41

Question 42