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Question

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

A
Adsorption is spontaneous
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B
Adsorption increases with increase in temperature
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C
Adsorption on solids is reversible
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D
Both enthalpy and entropy of adsorption are negative
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Solution

The correct option is B Adsorption increases with increase in temperature
As temperature increases desorption increases.
Adsorption+AdsorbateAdsorbed state+ΔE

Adsorption is exothermic process (forward direction), desorption is endothermic process (backward direction).

According to Le-Chatelier's principle, increase in temperature favours endothermic process.

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