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Q.

Which are of the following is a case of adsorption?

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a

Cotton clothes dipped in a dye solution

b

Silica gel in contact with water vapours

c

Ammonia gas in contact with water

d

Anhydrous ${CaCl}_{2}$ in contact with water vapour

answer is B.

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Detailed Solution

In silica gel, adsorption takes place due to the attraction and retention of water molecules on the surface.
Anhydrous ${CaCl}_{2}$ undergoes absorption because it combines with water molecules to form hydrated calcium chloride.
Silica gel adsorbs water vapour. It is thus use fuel in removing moisture from computer and electronic appliances. Hence, the correct answer is option B) Silica gel in contact with water vapours.

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