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

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

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Mass Transfer
When the solvent dissolves very little of solute, then

Very small quantity of solvent is required
Large quantity of solvent is required to extract the solute
Solvent of low freezing point should be used
Solvent of low latent heat of vaporisation should be used

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Mass Transfer
Relative humidity is the ratio of the

Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
None of these
Actual humidity to saturation humidity
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature

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