In mildly alkaline medium, thiosulphate ion is oxidized by \(\mathrm{MnO_4^-}\) to "A". The oxidation state of sulphur in "A" is __________.
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Correct Answer: 6
Solution and Explanation
\(\mathrm{8MnO_4^- + 3S_2O_3^{2-} + H_2O \to 8MnO_2 + 6SO_4^{2-} + 2OH^-}\).
Electron check: Mn goes from +7 to +4 (3 e- each, 8 Mn = 24 e-); the two S atoms of \(\mathrm{S_2O_3^{2-}}\) (average +2) go to +6 (8 e- per ion, 3 ions = 24 e-).
A = \(\mathrm{SO_4^{2-}}\): \(x + 4(-2) = -2 \Rightarrow x = +6\).
Answer: 6
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