Mass Transfer
For the same process conditions, the reflux ratio of an unlagged distillation column

Decreases in winter
None of these
Increases in winter
Increases in summer

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Mass Transfer
The rate of solid-liquid extraction is limited by the

Diffusion of the solute through the solvent in the pores to the outside of the particle
All of these
Phase change of the solute as it dissolves in the solvent
Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution

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Mass Transfer
Humid volume is the total volume in m³ of 1 kg of

Gas plus its accompanying vapour at 1 atm. and room temperature
Vapour laden gas at 1 atm. and gas temperature
Gas plus its accompanying vapour at 1 atm. and gas temperature
Vapour laden gas at 1 atm. and room temperature

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