Which of the following will not obey Henry's Law?
  1. CO
  2. CO2
  3. H2
  4. 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.
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