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Q.

Which of the following can not act as an adsorbent?

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a

Activated charcoal

b

Clay

c

Silica gel

d

Oxygen gas

answer is C.

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Detailed Solution

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Clays and their minerals are abundant and cheap material successfully used for decades as an adsorbent for removing toxic heavy metals from aqueous solutions.

Silica gel is a suitable adsorbent for water, alcohol, phenols, amines etc.

The unique voluminous and porous structure of activated charcoal makes it the most suitable candidate for surface binding (adsorption).

Hence the correct answer is (C).

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