12. The volume of gases H2, CH4 , CO2 and NH3 absorbed by 1 g of charcoal at 288K are in the order 
(1) H2 > CH​4 > C02 > NH3
(2) CH4 > C02 > NH3 > H2 
(3) C02 > NH3 > H2 > CH4 
(4) NH3 > C02 > CH4> H2 

Dear student,
A gas which can be most easily liquefied can be easily adsorbed.
NH3 due to hydrogen bonding can easily be liquefied hence has high volume of gas adsorbed.

Answer should be 4.

Hope it helps
Regards

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