Chemistry · Surface Chemistry

JEE Advanced 2022 — Paper 1 — Question 42

The correct opion(s) related to adsorption process is (are)

Option A:
Chemisorption results in unimolecular layer.
Correct
Option B:
The enthalpy change during physisorption is in the range of 100 to $140 \mathrm{~kJ} \mathrm{~mol}^{-1}$
Option C:
Chemisorption is an endothermic process
Option D:
Lowering the temperature favours physisorption process
Correct

Answer: A, D

$\rightarrow$ Chemisorption is unimolecular layer and exothermic.

$\rightarrow$ The enthalpy change in physiorption is $20-40 \mathrm{~kJ} / \mathrm{mol}$ .

$\rightarrow$ Physiorption decreases with increase of temperature.

Answer key and solution verified before publishing.

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