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

Increased diffusivity
Both Decreased viscosity of liquid & Increased diffusivity
None of the listed here
Decreased viscosity of liquid

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Mass Transfer
Flights in a rotary dryer are provided to

Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
Increase the residence time of the solid
None of these
Reduce the residence time of solid

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