JEE Main 2022 — Surface Chemistry Question with Solution
JEE Main 2022 (29 Jul Shift 2)
Question
Given below are the critical temperatures of some of the gases:
| Gas | Critical temperature |
The gas showing least adsorption on a definite amount of charcoal is
Choose an option
Show full solutionCorrect option: A
Step-by-step explanation
The amount of gas adsorbed by a solid depends on the nature of gas. In general, easily liquefiable gases (i.e., with higher critical temperatures) are readily adsorbed as van der Waals’ forces are stronger near the critical temperatures. Thus, 1g of activated charcoal adsorbs more sulphur dioxide (critical temperature 630K), than methane (critical temperature 190K) which is still more than 4.5 mL of dihydrogen (critical temperature 33K).
So, more the critical temperature of gas greater is the ease of liquefaction hence greater is the adsorption.
Hence, among the given gases ammonia is adsorbed most and helium the least on definite amount of charcoal.
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This is a previous-year question from JEE Main 2022, covering the Surface Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.