Ncert Exercises & Solutions

Which one of the following is not applicable to the phenomenon of adsorption?

$1 . Δ H > 0$ $1 . Δ H > 0$
$2 . Δ G < 0$ $2 . Δ G < 0$
$3 . Δ S < 0$ $3 . Δ S < 0$
$4 . Δ H < 0$ $4 . Δ H < 0$

(a) For phenomenon of adsorption

Δ

$∆$ H < 0, i,e, enllidluy change during phenomenon of adsorption is negative because, during adsorption, there is always a decrease in residual forces of the surface which lead to decrease in surface energy which appears as heat.

So, adsorption is an exothermic process and AH <0.

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