Which one of the following characteristics is not correct for physical adsorption?

Adsorption increases with increase in temperature

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Adsorption is spontaneous

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Both enthalpy and entropy of adsorption are negative

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Adsorption on solids is reversible

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Solution

The correct option is C Adsorption increases with increase in temperature
Adsorption is an exothermic process. So it's enthalpy is negative and adsorption decreases with increase in temperature (according to Le-Chatlier's Principle). As a gas get absorbed, its restrictions increase, therefore entropy is negative.

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