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Mass Transfer

Mass Transfer
The relative volatility of a binary mixture at the azeotropic composition is

1
> 1
∞

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Mass Transfer
With increase in temperature, the rate of leaching increases, because the

Thermal conductivity of solute increases
None of these
Viscosity of solvent decreases
Diffusivity of solute increases

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

3 to 4
2.5 to 3
5
1.2 to 1.5

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Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Thermal decomposition of bottoms
Erosion of the tower
Increased relative volatility
Very efficient operation

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Mass Transfer
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will

Depend on saturated boiling point; may increase or decrease
Increase
Decrease
Remains same

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Mass Transfer
Berl saddle made of carbon cannot be used for

SO₂
Oxidising atmosphere
H₂SO₄
Alkalis

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