Which of the following will not obey Henry's Law?
- CO
- CO2
- H2
- O2
It depends on the solvent in which you are dissolving it. Also the 2 conditions for henry's law are that gas must be ideal and it does not react with solvent. So if you take a solvent check whether any of them makes a compound with it or not? If yes then that is your answer. Otherwise, check the deviation from ideal behaviour. Any gas which shows large deviation from ideal behaviour at a specified temperature is your answer.