Solve this : 13. A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number? (a) S (b) H (c) CI (d) C (AIPMT Prelims 2012) Share with your friends Share 0 Chandresh Kumar Patel answered this Dear student Regards 0 View Full Answer