The heat evolved in physisorption lies in the range (in \( \mathrm{kJ} / \mathrm{mol} \) ) of : ...

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The heat evolved in physisorption lies in the range (in \( \mathrm{kJ} / \mathrm{mol} \) ) of :
(a) 20-40
(b) 40-100
(c) 100-200
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