JEE Main Chemistry question

Not in JEE Main or NEET syllabus

In Langmuir's model of adsorption of a gas on a solid surface

(A)The rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered
(B)The adsorption at a single site on the surface may involve multiple molecules at the same time
(C)The mass of gas striking a given area of surface is proportional to the pressure of the gasCorrect
(D)The mass of gas striking a given area of surface is independent of the pressure of the gas

Answer: (C)

Solution

Langmuir's model assumes that each adsorption site can hold only one molecule (ruling out (B)) and that the rate of desorption depends on the fraction of surface covered (ruling out (A), and making (D) false as well, since by kinetic theory the mass of

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Question ID VK-144692