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Mass Transfer

Mass Transfer
CO₂ can be absorbed by

Alumina
Hot cupric oxide
Cold Ca(OH)₂
Heated charcoal

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Mass Transfer
Physical absorption is

A reversible phenomenon
An irreversible phenomenon
Accompanied by evolution of heat
Both B & C

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Mass Transfer
Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be

1
≤ 1
> 1
< 1

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Mass Transfer
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

10
5
100
1

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Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

0.25
1.25
2.5
0.0025

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Mass Transfer
In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.

Increases with increase in
Neither A nor B
Both A and B
Is one at unity value of

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