(B) In $FeS_2$ (iron pyrite),the sulfur exists as the disulfide ion $(S_2^{2-})$. Each sulfur atom in the $S_2^{2-}$ unit has an oxidation state of $-

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(B) In $FeS_2$ (iron pyrite),the sulfur exists as the disulfide ion $(S_2^{2-})$. Each sulfur atom in the $S_2^{2-}$ unit has an oxidation state of $-1$. In $FeS$,$S$ is $-2$. In $Na_2SO_3$,$S$ is $+4$. In $Na_2S_2O_3$,the average oxidation state of $S$ is $+2$,with individual atoms being $0$ and $+4$.