61.
The value of $$\frac{{{{\text{N}}_{\text{A}}}}}{{{{\text{N}}_{\text{A}}} + {{\text{N}}_{\text{B}}}}},$$   for steady state equimolal counter diffusion of two gases 'A' and 'B' is

63.
Reboiler is considered as one theoretical plate, because

64.
Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in

66.
Pick out the wrong statement.

68.
Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in

70.
With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________ , if the conduction and radiation through the solid are negligible.

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