A) Chemisorption
B) Physisorption
C) Desorption
D) Sorption
Correct Answer: D
Solution :
When adsorption and absorption both take place simultaneously the phenomenon is called sorption e.g., dyes get adsorbed and absorbed on cotton fibres i.e., sorption takes place. Adsorption involves unequal distribution of molecular species in bulk and at surface (more on surface). Adsorption involve uniform distribution of molecular species throughout the bulk. Physical adsorption: If the forces of attraction existing between adsorbate and adsorbent are van der Waals' forces the adsorption is called physical adsorption (Reversible) Chemical adsorption: If forces of attraction existing between adsorbate and adsorbent are almost of same strength as chemical bonds the adsorption is called chemical adsorption (irreversible) Desorption: The process of removal of an adsorbed substance (adsorbate) from the surface on which it is adsorbed (adsorbent) is called desorption.
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