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 :
Adsorption of a gas on solid is represented by following equilibria, \[\underset{(Adsorbate)}{\mathop{Gas}}\,+\underset{(Adsorbent)}{\mathop{Solid}}\,\rightleftharpoons \underset{adsorbedonsoild}{\mathop{Gas+Heat}}\,\] Initially adsorption increases with increase in pressure at a particular temperature, then get slow. After attaining equilibrium adsorption it becomes independent of pressure.
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