Q.

Adsorption is accompanied by

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a

increase in enthalpy and decrease in entropy.

b

increase in enthalpy and increase in entropy.

c

decrease in enthalpy and decrease in entropy.

d

decrease in enthalpy and increase in entropy.

answer is C.

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Detailed Solution

Adsorption is an exothermic process i.e. H of adsorption is always negative. When a gas is adsorbed, the freedom of movement of its molecules becomes restricted i.e. S is negative. Hence adsorption accompanied by decrease in enthalpy as well as decrease in entropy of the system.

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