Adsorption is the phenomenon in which a substance:

accumulates on the surface of the other substance

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remains close to the other substance

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substance particles bind with each other

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oxidises or reduces the other substance

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Solution

The correct option is A accumulates on the surface of the other substance

Adsorption is the adhesion(accumulation) of molecules of gas, liquid, or dissolved solid particles on to the surface. In this process a layer of the adsorbate (the molecules or atoms being accumulated) on the surface of the adsorbent.
Hence option A is correct.

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