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(A) The extent of adsorption of a gas on a solid surface depends on its critical temperature $(T_c)$.Greater the critical temperature of a gas,more ea

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$III > II > I$

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(A) The extent of adsorption of a gas on a solid surface depends on its critical temperature $(T_c)$.Greater the critical temperature of a gas,more easily it can be liquefied and hence more strongly it is adsorbed on the solid surface.The critical temperatures of the given gases are: $SO_2$ $(430 \ K)$,$CH_4$ $(190 \ K)$,and $H_2$ $(33 \ K)$.Thus,the order of critical temperatures is $SO_2 > CH_4 > H_2$.Therefore,the correct order of adsorption is $III > II > I$.

The correct order of adsorption of the following gases on the surface of charcoal is: $H_2$ $(I)$,$CH_4$ $(II)$,$SO_2$ $(III)$.

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