####53. In self-reduction, the reducing species is
(a) $S$
(b) $O^{2-}$
(c) $S^{2-}$
(d) $SO _2$
In $Cu _2 S$, sulphur is $S^{2-}$ and in $SO _2$, sulphur is in +4 state.
Hence, $S^{2-}$ is acting as reducing agent.
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