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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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