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Question

Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate is adsorbed to greater extent irrespective of its amount present. For example, H2O is adsorbed to more extent on silica gel than N2 and O2. This shows that some adsorbates are preferentially adsorbed. It is also observed that preferentially adsorbable adsorbents can displace a weakly adsorbed substance from the surface of an adsorbent.

Chromatogarphic separations are based on:

A
differential solubility
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B
differential adsorption
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C
differential absorption
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D
None of these
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Solution

The correct option is B differential adsorption
Chromatographic separations of mixtures of various compounds are based on their distribution between a stationary and a mobile phase, which is present in a chromatographic column. The mobile phase moves across the column, in effect washing (eluting) compounds at a different rate. These differences are based on properties such as the boiling point, the polarity, the electric charge (for ionic compounds), the size of the molecule, and so forth.

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