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Which of the following is chemisorption

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Adsorption of moisture on silica gel

Adsorption of H₂ on charcoal

Adsorption of H₂ on Ni at high temperature

Dehydration by using anhydrous CaCl₂

answer is A.

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Detailed Solution

Hydrogen molecules are first adsorbed on nickel by vanderwaals forces. The adsorbed hydrogen molecules dissociate to form hydrogen atoms. These atoms are held on the surface by chemisorption

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