(B) $1$. Physisorption is exothermic and generally decreases with an increase in temperature. $2$. Chemisorption often requires activation energy and

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The extent of chemisorption decreases with an increase in temperature,while the extent of physisorption increases.

(B) $1$. Physisorption is exothermic and generally decreases with an increase in temperature. $2$. Chemisorption often requires activation energy and may increase initially with temperature before decreasing. $3$. Statement $B$ is incorrect because the extent of physisorption decreases with an increase in temperature,whereas the statement claims it increases.

Class 12 Chemistry Surface Chemistry Adsorption and Adsorption isotherm

Difficult

Which of the following statements is $NOT$ correct?

A
Physisorption occurs at very low temperatures and chemisorption occurs at all temperatures.
B
The extent of chemisorption decreases with an increase in temperature,while the extent of physisorption increases.
C
Chemisorption is irreversible,while physisorption is reversible.
D
The activation energy of desorption in physisorption is very low,while the activation energy in chemisorption is very high.