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Mass Transfer

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
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )

P < P
P >>P
P
P = P

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Mass Transfer
__________ is concerned with the adsorption equilibria.

None of these
Freundlich equation
Gibb's equation
Fick's law

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Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

2.5 to 3
3 to 4
1.2 to 1.5
5

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Mass Transfer
At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes

1
?
None of these

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Mass Transfer
'ADDUCTS' and 'CLATHRATES' are used in case of

Extractive distillation
Absorption
None of these
Crystallisation

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