Mass Transfer
Leaching of uranium ore and gold ore is done in

Centrifugal extractor
Bollman extractor
None of these
Pachuka tanks

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Mass Transfer
For absorbing a sparingly soluble gas in a liquid

Gas side mass transfer co-efficient should be increased
Liquid side mass transfer co-efficient should be decreased
Liquid side mass transfer co-efficient should be increased
Mass transfer co-efficient must be kept constant

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