Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.

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Solution

During adsorption, the concentration of one substance on the surface of other substance is much higher than the concentration in the bulk. On the other hand, during absorption, there is uniform distribution of molecules of one substance throughout the body of other substance.
Thus, silica gel adsorbs water vapour while anhydrous calcium chloride absorbs water.

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