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Mass Transfer

Mass Transfer
Molality is defined as the number of gm moles of solute per __________ of solvent.

Gm
m³
Litre
Kg

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Mass Transfer
In extractive distillation, solvent is

Present in overhead stream
Of high volatility
Of high viscosity to give high tray efficiency
Added to alter the relative volatility of the mixture

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Mass Transfer
Molecular seives are porous

Silica
Synthetic zeolites crystals/metal alumino-silicates
None of these
Alumina

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(4De/t)
(De/t)1/2
(De.t)1/2
(4De/πt)1/2

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Mass Transfer
Azeotropic distillation is employed to separate

Heat sensitive materials
Mixture with very high relative volatility
High boiling mixture
Constant boiling mixture

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Mass Transfer
In a packed bed absorption column, the channelling will be noted by the

Sharp drop in pressure drop
Sharp rise in pressure drop
Increase in flow rate
None of these

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