The oxidation number of Sulphur in S₈ and S₂F₂ respectively are

Match the half-reactions (in column I) with change in oxidation number (in column II)

The number of oxygen atoms showing –1 oxidation state in CrO5 molecule are:

Which of the following is a redox reaction?

Given; Co3+ + e− → Co2+ ; E° = +1.81V Pb4+ + 2e− → Pb2+ ; E° = +1.67V Ce4+ + e− → Ce3+ ; E° = +1.61V

–3 oxidation state of nitrogen will be obtained in case of;