Mass Transfer
Stage efficiency in a leaching process depends on the

Time of contact between the solid and the solution
Both A & B
Vapour pressure of the solution
Rate of diffusion of the solute through the solid and into the liquid

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Mass Transfer
In case of a desorber (stripper), the

Temperature remains unaffected
Operating line always lies below the equilibrium curve
Operating line always lies above the equilibrium curve
Temperature always increases

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Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
Total pressure throughout the liquid phase is equal to that throughout the vapor phase
Temperature of the liquid phase is equal to that of the vapor phase
All of these

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Mass Transfer
Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

And dehumidified with decrease in wet bulb temperature
And dehumidified with increase in wet bulb temperature
And humidified
At the same relative humidity

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Mass Transfer
A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture?

The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10
The mixture exhibits an azeotrope at 101.3 kPa
The composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and m-xylene 10
The mixture contain optical isomers

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