Which anion can undergo both oxidation and reduction? (a) \( \mathr...

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Which anion can undergo both oxidation and reduction?
(a) \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \)
(b) \( \mathrm{NO}_{3}^{-} \)
(c) \( \mathrm{OCl}^{-} \)
(d) \( \mathrm{S}^{2-} \)
\( \mathrm{P} \)
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