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Why is adsorption always exothermic ?

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Why is adsorption always exothermic ?

    • Posted by Shruti Duddi 3 years, 9 months ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 3 years, 9 months ago

    Adsorption is always exothermic. This statement can be explained in two ways.

    (i) Adsorption leads to a decrease in the residual forces on the surface of the adsorbent. This causes a decrease in the surface energy of the adsorbent. Therefore, adsorption is always exothermic.
    (ii) ΔH of adsorption is always negative. When a gas is adsorbed on a solid surface, its movement is restricted leading to a decrease in the entropy of the gas i.e., ΔS is negative. Now for a process to be spontaneous, ΔG should be negative.

    ΔG = ΔH - TΔS

    Since ΔS is negative, ΔH has to be negative to make ΔG negative. Hence, adsorption is always exothermic.

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