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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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Knowledge Check

  • H_(2) gas is adsorbed on activated charcoal to a very little extent in comparison to easily liquefiable gases due to -

    A
    very strong van der Waals' interaction
    B
    very weak van der Waals' forces
    C
    very low critical temperature
    D
    very high critical temperature

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