Which of the following is true regarding absorption and adsorption?

In absorption, the substance is uniformly distributed throughout the bulk of the solid.

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In absorption, the substance is concentrated only at the surface and does not penetrate through the surface.

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In adsorption, the substance is concentrated only at the surface and does not penetrate through the surface.

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(a) and (c) above.

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Solution

The correct option is D (a) and (c) above.

Absorption Adsorption

The substance is uniformly distributed throughout the bulk of the solid. The substance is concentrated only at the surface and does not penetrate through the surface to the bulk of the adsorbent.

The concentration is uniform throughout the bulk of the material. The concentration of the adsorbate increases only at the surface of the adsorbent

Suggest Corrections

Absorption	Adsorption
The substance is uniformly distributed throughout the bulk of the solid.	The substance is concentrated only at the surface and does not penetrate through the surface to the bulk of the adsorbent.
The concentration is uniform throughout the bulk of the material.	The concentration of the adsorbate increases only at the surface of the adsorbent