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Why do charcoal, silica gel, alumina gel...

Why do charcoal, silica gel, alumina gel, ete. act as very good adsorbents?

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Adsorption is a surface phenomenon. The larger the surface area of an adsorbent, the greater its adsorptive capacity. Since charcoal, silica gel, alumina gel are porous substances, they have larger surface area, and hence are very good adsorbents.
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CHHAYA PUBLICATION-SURFACE CHEMISTRY-Question-Answer Zone for Board Examination
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