Which of the following samples of reducing agents is / are chemically equivalent to \(\mathrm{25....

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Which of the following samples of reducing agents is / are chemically equivalent to \(\mathrm{25 ~mL}\) of \(\mathrm{0.2 ~N}\) \(\mathrm{ KMnO _4}\) to be reduced to \(Mn ^{2+}\) and water?
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