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

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

AIEEEAIEEE 2003Surface Chemistry

Solution:

As temperature increases desorption increases. Adsorbent $+$ Adsorbate $\rightleftharpoons$ Adsorbed state $+\Delta E$ Adsorption is exothermic process (forward direction), desorption is endothermic process (Backward direction)

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