In netural of faintly alkaline medium, thiosulphate is quantitatively oxidized by `KMnO_(4)` to

Options

A. `So_(3)^(2-)`
B. `So_(4)^(2-)`
C. `So_(5)^(2-)`
D. `S_(2)O_(8)^(2-)`

Answer

B

Explanation

In netural or weakly alkaline medium thiosulphtae is quantitatively oxidized by `KMnO_(4)` to sulphate. According to the equation,
`8MnO_(4)^(-) + 3S_(2)O_(3)^(2-) + H_(2)O to 8MnO_(2) + 6SO_(4)^(2-) + 2OH^(-)`