Mass Transfer
H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

1.56
2
1
0.56

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Mass Transfer
In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions:(i) Reflux stream is completely liquid and is at its bubble point.(ii) Reflux stream is below its bubble point.

Condenser and reboiler loads are the same in both the cases
Both condensor and reboiler loads are higher in case (ii) as compared to case (i)
Reboiler load is the same in both the cases but condenser load is higher in case (ii)
Condenser load is the same in both the cases but reboiler load is higher in case (ii)

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Mass Transfer
Pick out the wrong statement. Raoult's law does not apply, when the

Chemical combination or molecular association between unlike molecules takes place in the formation of solution
Size of component molecules are not equal
Attractive forces between like and unlike molecules in the solution are approximately equal
Component molecules are nonpolar

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