In Langmuir's model of adsorption of a gas on a solid surface [AIEEE 2006]

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