The number of moles of `KMnO_(4)` that will be needed to react with `1 mol` of sulphite ion in acidic solution is

Options

A. (a)`4//5`
B. (b)`3//5`
C. (c )`1`
D. (d)`2//5`

Answer

d

Explanation

The balance chemical equation is:
`2MnO_(4)^(-)+6H^(+)+5SO_(3)^(-) rarr`
`2Mn^(++)+5SO_(4)^(-)+3H_(2)O`
From the equation it is clear that
Moles of `MnO_(4)^(-)` required to oxidise 5 moles of `SO_(3)^(-)` are 2
Moles of `MnO_(4)^(-)` required to oxidise 1 moles of `SO_(3)^(-)` are `2//5`.