TheNumber of moles of kmno4 that will be needed to react with 1mole of sulphite ion in acidic soln is? Explain

Question

The option for above Question is
1)2/5
2)3/5
3)4/5
4)1

Answer 1

4)1

Answer 2

When you have worked out the half-equations, you will see that MnO4- requires 5 electrons, and sulphite gives away two.
So 2/5 of a mole of MnO4- is needed per mole of sulphite.