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Question:

Given that Gas H2 CH4 CO2 SO2 Critical Temperature (K) 33 190 304 630. On the basis of data given above, predict which of the following gases shows least adsorption on a definite amount of charcoal?

SO2

H2

CH4

CO2

Solution:

Smaller the value of 'a' or the critical temperature of a gas, lesser is the extent of adsorption. Here the critical temperature of the H2 gas is lowest. So the least adsorbed gas is H2.