In which of the following reactions does the | vedclass

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(C) To determine where sulfur is reduced,we look for a decrease in the oxidation state of sulfur.In option $A$,$S$ goes from $+4$ in $SO_3^{2-}$ to $+

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$H_2SO_4 + I^- \longrightarrow I_2 + SO_2$

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(C) To determine where sulfur is reduced,we look for a decrease in the oxidation state of sulfur.In option $A$,$S$ goes from $+4$ in $SO_3^{2-}$ to $+6$ in $SO_4^{2-}$ (oxidation).In option $B$,$S$ goes from $-2$ in $H_2S$ to $0$ in $S$ (oxidation).In option $C$,$S$ goes from $+6$ in $H_2SO_4$ to $+4$ in $SO_2$ (reduction).In option $D$,there is no change in the oxidation state of sulfur ($+6$ to $+6$).Therefore,the correct reaction is $H_2SO_4 + I^- \longrightarrow I_2 + SO_2$.

In which of the following reactions does the element sulfur get reduced?

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