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Which of the following is not considered as absorption?

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Chalk piece dipped in ink

Sponge placed in water

$H_{2}$ gas in contact with finely divided $Pd$

Finely divided charcoal stirred with dilute acetic acid

answer is C.

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Detailed Solution

When a molecule or ionic species is accumulated inside the bulk of a solid or liquid, the process is known as absorption. It is a bulk phenomenon.

When finely divided charcoal is stirred with dilute acetic acid, the charcoal adsorbs the acetic acid molecules on the surface as it is a surface phenomenon, not bulk phenomenon.

Therefore, option (C) is correct.

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