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Complete the given reaction equation.

a) S + O2 -> degree of oxidation of element 1 of the product (+6)

b) N2 + O2 -> degree of oxidation of element 1 of the product (+5)

c) Mg + O2 -> degree of oxidation of element 1 of the product (+2)

d) Fe + O2 -> degree of oxidation of element 1 of the product (+3)