NEET levelSingle correct optionDifficulty 1 of 3sc003
At constant pressure, on increasing the temperature the extent of physisorption of a gas on a solid generally:
Aincreases continuously
Bremains unchanged
Cfirst increases and then decreases
Ddecreases
Answer: D
Physisorption is exothermic, so by Le Chatelier's principle it falls as temperature rises. The first-increase-then-decrease pattern is the behaviour of chemisorption, which needs activation energy.