Mass Transfer
When a multistage tray tower uses a minimum reflux ratio, it implies

Infinite trays and maximum reboiler heat load
Infinite trays and minimum reboiler heat load
Minimum trays and maximum reboiler heat load
Minimum trays and minimum reboiler heat load

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

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

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