JEE Advanced Chemistry Question (2022) — Solution

Step-by-step solution

(A) First statement is correct as chemisorption results in a unimolecular layer and physisorption result in a multimolecular layer. (B) Second statement is incorrect as enthalpy change during physisorption is of the range of 20 - 40 kJmol - 1 .Gases with higher critical temperatures are readily adsorbed (C) Chemisorption is an exothermic process with 80 - 240 kJmol - 1 as the enthalpy of adsorption. (D) Lowering the temperature results in increase in the extent of physisorption.It decreases with increase of temperature. Hence (A) and (D) are correct.