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a
an exothermic process hence, increase in temperature decreases adsorption in case where van der Waals' forces exist between adsorbate and adsorbent
b
an endothermic process, hence increase in temperature increases adsorption
c
an exothermic process, hence increase in temperature increases adsorption
d
not defined by any of the above terms
answer is A.
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Detailed Solution
Adsorption is spontaneous and takes place with decrease in entropy.ΔG=ΔH−TΔS⇒ΔH=ΔG+TΔS Being spontaneous, ΔG <0, Also, ΔS<0 Hence, ΔH=− ve Thus exothermic. in an exothermic process, extent of reaction decreases with increase in temperature based on Le-Chatelier's principle.