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

Adsorption is spontaneous.

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Δ H

and

Δ S

are negative.

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It is reversible in nature.

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Degree of adsorption increases with temperature.

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Solution

The correct option is C Degree of adsorption increases with temperature.
Accumulation of molecular species at the surface rather than in the bulk of a solid or liquid is termed adsorption. Physical adsorption occurs readily at low temperature and decreases with increasing temperature. Physical adsorption is an exothermic process but its enthalpy of adsorption is quite low. Physical adsorption of a gas by a solid is generally reversible.
Therefore, option D is the incorrect statement.

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