In an experiment \( 50 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \) solution of a salt reacted with \...

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In an experiment \( 50 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \) solution of a salt reacted with \( 25 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \) solution of sodium sulphite. The half equation for the oxidation of sulphite ion is: \( \mathrm{SO}_{3}^{2-}(a q)+\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{SO}_{4}^{2-}(a q)+2 \mathrm{H}^{+}(a q)+2 e^{-} \).If the oxidation number of metal in the salt was 3 , what would be the new oxidation number of metal?
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