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How do size of particles of adsorbent, p...

How do size of particles of adsorbent, pressure of gas, and prevailing temperature influence the extent of adsorption of a gas on a solid?

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(a) Smaller the size of the particles of the adsorbent, greater is the surface area and hence greater is the adsorption
(b) At constant temperature, adsorption first increases with increase of pressure and then attains equilibrium.
(c) In physical adsorption, it decreases with increase of temperature but in chemisorption, first it increases and then decreases.
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