Which of the following options is not true about adsorption?

It is the phenomenon of accumulation of a higher concentration of gas or liquid on the surface than in the bulk of the solid.

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It is the phenomenon of the accumulation of a low concentration of gas or liquid on the surface than in the bulk of the solid.

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It is rapid in the beginning and its rate slowly decreases.

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It is an endothermic process

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Solution

The correct option is D It is an endothermic process
a) The adsorption phenomenon where the concentration of a gas or a liquid on the surface is higher than in the bulk of solid is called positive adsorption.
Example: When a concentrated solution of $K C l$ is shaken with blood charcoal, it shows positive adsorption.
b) The adsorption phenomenon where the concentration of a gas or a liquid on the surface is lower than the bulk of the solid is called negative adsorption.
c) It is rapid in the beginning and its rate slowly decreases as the number of sites available in the adsorbent decreases.
d) Adsorption is an exothermic process.

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