The number of electrons lost or gained during the change ${\rm{Fe}} + {{\rm{H}}_2}{\rm{O}} \to {\rm{F}}{{\rm{e}}_3}{{\rm{O}}_4} + {{\rm{H}}_2}$ is

JEE CHEMISTRY MCQ: REDOX REACTIONS

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The number of electrons lost or gained during the change

\mathrm{Fe} + {\mathrm{H}_2}\mathrm{O} \to \mathrm{F}{\mathrm{e}_3}{\mathrm{O}_4} + {\mathrm{H}_2}

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Correct option: D

Option D (8) is correct because the balanced redox reaction involves a loss of 8 electrons during the oxidation of iron.

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\mathrm{H}

2 \mathrm{KClO}_3 \longrightarrow 2 \mathrm{KCl}+3 \mathrm{O}_2

\mathrm{HNO}_3

\mathrm{HNO}_3

\mathrm{MnO}_4^{-}(\mathrm{aq})+\mathrm{Br}^{-}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{MnO}_2(\mathrm{aq})+\mathrm{BrO}_3^{-}(\mathrm{aq})+2 \mathrm{OH}^{-}(\mathrm{aq})

\mathrm{Br}

-1

+5.