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Q.

Which one of the following is an example of adsorption?

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a

Ammonia in contact with water

b

Anhydrous CaCl2 with water

c

Silica gel in contact with water vapours

d

All of these

answer is B.

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Detailed Solution

Absorption means penetration of adsorbate molecules into the bulk of the adsorbent. When water is spread over calcium chloride, water penetrates into the bulk of the calcium chloride.

Hence the correct answer is (B) .

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