A) Fast \[\to \] slow \[\to \] independent of the pressure
B) Slow \[\to \] fast \[\to \] independent of the pressure
C) Independent of the pressure \[\to \] fast \[\to \] slow
D) Independent of the pressure \[\to \] slow \[\to \] fast
Correct Answer: A
Solution :
[a] Adsorption of a gas on solid is represented by following equilibria, Gas (Adsorbate) + Solid (Adsorbent)\[\] \[\rightleftharpoons \] Gas adsorbed on solid + Heat Initially adsorption increases with increase in pressure at a particular temperature then got slow. After attaining equilibrium, adsorption becomes independent of pressure.
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