Multiple choice

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

  1. the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered

  2. the adsorption at a single site on the surface may involve multiple molecules at the same time

  3. the mass of gas striking a given area of surface is proportional to the pressure of the gas

  4. the mass of gas striking a given area of surface is independent of the pressure of the gas
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C Correct answer
Explanation

In the Langmuir adsorption isotherm, the rate of gas molecules striking the surface is directly proportional to the pressure of the gas.

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