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Valency and Oxidation States

SO2 is oxidis...

Question

$S O_{2}$ is oxidised to ${S O_{4}}^{2 -}$ in acid medium. Calculate equivalent mass of $S O_{2}$ .

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Solution

$S_{2} (g) + 2 H_{2} O \to_{2} + 6 - 8 S O_{4} + 2 H^{+} + 2 e^{-}$
Change in oxidation number of sulphur $= 6 - 4 = 2$
Equivalent mass of $S O_{2} = \frac{M o l e c u l a r m a s s}{2} = \frac{64}{2} = 32$ .

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