Question

The number of moles of `KMnO_(4)` that will be needed to react with `1 mol` of sulphite ion in acidic solution is
A. `(2)/(5)`
B. `(3)/(5)`
C. `(4)/(5)`
D. `1`

Answer 1

Correct Answer - A
`underset((n=5))("Eq of" MnO_(4)^(ө))=underset((n=2)) ("Eq of" SO_(3)^(2-)(SO_(3)^(2-)+2e^(-)))`
`1Eq = 1Eq`
`(1)/(5)mol=(1)/(2)mol`
`(2)/(5) "mol of" MnO_(4)^(ө) = 1 "mol of" SO_(3)^(2-)`.