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Why is adsorption always exothermic ?...

Why is adsorption always exothermic ?

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Adsorption is accompanied by decrease of randomness, i.e. this factor opposes the process, i.e. `triangleS` is -ve. For the process to be spontaneous, `triangleG` must be -ve. Hence, according to eqn, `triangleG = triangleH - TtriangleS, triangleG` can be -ve only if `triangleH` is -ve.
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Knowledge Check

  • The correct statement(s) pertaining to the adsorption of a gas on a solid surface is(are) (i) adsorption is always exothermic (ii) physisorption may transform into chemsisorption transform into chemisorption at high temperature (iii) physisorption increases with increasing temperature but chemisorption decreases with increasing temperature . (iv) chemisorption is more exothermic than physisorption , however it is very slow due to higher energy of activation.

    A
    (i) and (iv) only
    B
    (ii) and (iii) only
    C
    (i),(ii) and (iv) only
    D
    All of these.

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