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

Answer

A

Explanation

`2KMnO_(4)+3HSO_(4) rarr K_(2)SO_(4)+2MNSO_(4)+3H_(2)O+5[o]`
`([SO_(3)^(2-)+[O] rarr SO_(4)^(2-)]xx5)/(2KMnO_(4)+3H_(2)SO_(4)+5SO_(3)^(2-) rarr K_(2)SO_(4))`
or `(+2MnSO_(4)+3H_(2)O+5SO_(4)^(2-))/(2MnO_(4)^(-)+6H^(+)+5SO_(3)^(2-) rarr 2Mn^(2+))+5SO_(4)^(2-)+3H_(2)O`
5 moles of `SO_(7)^(2-)` required 2 moles of `MnO_(4)^(-)`
1 moles of `SO_(7)^(2-)` will be required `2/5` moles of `MnO_(4)^(-)`