38. Write Lewis structure of O2- ion and find out oxidation state of each oxygen atom? What is the average oxidation state of oxygen in this ion?


The Lewis structure of O2-is
Oxygen atom carrying no charge has six electrons, so its oxidation number is zero. But oxygen atom carrying - 1 charge has 7 electrons, so its oxidation number is -1.
Average oxidation number of each oxygen atom=12
O2-=2x=-1x=-12