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

Options

A. `2//5`
B. `3//5`
C. `4//5`
D. 1

Answer

A

Explanation

`2MnO_4^(-) + 5SO_3^(2-) +6H^(+) to 2Mn^(2+) + 5SO_4^(2-) + 3H_2O`
` therefore ` 5 mol of `SO_3^(2-) = 2` mol of `MnO_4^-`
1mol of `SO_3^(2-) = 2/5` mol of `MnO_4^-`