Select the correct statement(s).

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Residual force-field on a surface is responsible for adsorption

Rate of adsorption is very rapid in the beginning but decreases until equilibrium is attained

Adsorption and desorption are two opposite terms

When multilayers are formed, desorption also takes place

answer is A.

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Detailed Solution

(1) There are residual forces acting along the a surface of liquid. This is also expected for a surface of a solid. Due residual to forces, the surface of a solid (or a liquid) has a to attract and tendency retain molecule of other species with which it brought into contact. Thus, correct.(2) At start, adsorption is slow, when multilayers are formed, saturation is attained and rate of adsorption decreases. When desorption also starts at equilibrium. Rate of adsorption ⇌ rate of desorption. Thus, correct (3) True(4) True

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