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(C) To find the oxidation number of sulphur $(S)$ in each species:$1$. In $SO_3^{2-}$: $x + 3(-2) = -2 \implies x - 6 = -2 \implies x = +4$.$2$. In $H

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$S_2O_3^{2-}$

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(C) To find the oxidation number of sulphur $(S)$ in each species:$1$. In $SO_3^{2-}$: $x + 3(-2) = -2 \implies x - 6 = -2 \implies x = +4$.$2$. In $H_2S_2O_8$ (Marshall's acid): This contains a peroxide linkage. $2(+1) + 2(x) + 6(-2) + 2(-1) = 0 \implies 2 + 2x - 12 - 2 = 0 \implies 2x = 12 \implies x = +6$.$3$. In $S_2O_3^{2-}$: $2x + 3(-2) = -2 \implies 2x - 6 = -2 \implies 2x = 4 \implies x = +2$.$4$. In $SO_2$: $x + 2(-2) = 0 \implies x - 4 = 0 \implies x = +4$.Comparing the oxidation states: $+4, +6, +2, +4$. The minimum oxidation number is $+2$ in $S_2O_3^{2-}$.

In which of the following molecules or ions does sulphur have the minimum oxidation number?

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