Question

What is the oxidation number of Manganese in MnO₄^-?

What is the oxidation number of sulphur in S₄O₆^2- ?

Answer 1

Manganate ions, or MnO4, have a charge of -1. Oxygen will usually have an oxidation number of -2. So the oxidation number of Mn in the MnO4 ion is +7.

All the S atoms in S4O6^2 - have oxidation number equal to + 2.5 .