The correct option(s) related to adsorption processes is(are)
- (A)Chemisorption results in a unimolecular layer.✓ Correct
- (B)The enthalpy change during physisorption is in the range of 100 to .
- (C)Chemisorption is an endothermic process.
- (D)Lowering the temperature favors physisorption processes.✓ Correct
Answer: (A), (D)
Solution
(A) Chemisorption involves strong chemical bonds and results in a unimolecular (monolayer) coverage. Correct.
(B) The enthalpy change during physisorption is typically in the range of 20-40 kJ/mol, much less than 100-140 kJ/mol. Incorrect.
(C) Chemisorption of gases on solids is generally exothermic, not endothermic. Incorrect.
(D) Since physisorption is an exothermic process, lowering the temperature favors it according to Le Chatelier's principle. Correct.
(B) The enthalpy change during physisorption is typically in the range of 20-40 kJ/mol, much less than 100-140 kJ/mol. Incorrect.
(C) Chemisorption of gases on solids is generally exothermic, not endothermic. Incorrect.
(D) Since physisorption is an exothermic process, lowering the temperature favors it according to Le Chatelier's principle. Correct.
JEE Advanced · 2022 · 28 Aug 2022 · Paper 1 · One or more correct options