Discussion
Assertion (A): The Langmuir isotherm predicts a coverage that saturates at high pressure.
Reason (R): There are a finite number of sites and each can hold only one molecule.
Answer: B
Both are true and the reason gives the mechanism: once every site is occupied, further pressure can add nothing, which is exactly the plateau the isotherm shows. Coverage cannot exceed one monolayer. Saturation is the defining feature of the isotherm.
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