Four gases A, B, C and D have critical temperature 5.3, 33.2, 126.0 and 154.3K respectively. For their adsorption on a fixed amount of charcoal, the correct order is:
(1) D > C > B > A
(2) C > B > D > A
(3) D > C > A > B
(4) C > D > B > A

Answer: Option 1
Solution:  The amount of gas adsorbed by a solid depends on the nature of the 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.
i.e., Extent of adsorption  a  critical temperature.
Hence, correct order is D > C > B > A

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