Which substance serves as a reducing agent in the following reaction, $14{{\rm{H}}^ + } + {\rm{C}}{{\rm{r}}_2}{\rm{O}}_7^{2 - } + 3{\rm{Ni}} \to 2{\rm{C}}{{\rm{r}}^{3 + }} + 7{{\rm{H}}_2}{\rm{O}} + 3{\rm{N}}{{\rm{i}}^{2 + }}?$

${\rm{C}}{{\rm{r}}_2}{\rm{O}}_7^{2 - }$

NEET UG CHEMISTRY MCQ: REDOX REACTIONS

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Which substance serves as a reducing agent in the following reaction,

14{\mathrm{H}^ + } + \mathrm{C}{\mathrm{r}_2}\mathrm{O}_7^{2 - } + 3\mathrm{Ni} \to 2\mathrm{C}{\mathrm{r}^{3 + }} + 7{\mathrm{H}_2}\mathrm{O} + 3\mathrm{N}{\mathrm{i}^{2 + }}?

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Correct option: C

{\mathrm{H}^ + }

Option B (Ni) is correct because Ni is oxidized in the reaction, thus acting as a reducing agent.

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{I_2}

\mathrm{MnO}_4^ - + {\mathrm{C}_2}\mathrm{O}_4^{2 - } + {\mathrm{H}^ + } \to \mathrm{M}{\mathrm{n}^{2 + }} + \mathrm{C}{\mathrm{O}_2} + {\mathrm{H}_2}\mathrm{O}

\mathrm{MnO}_4^ -

{\mathrm{C}_2}\mathrm{O}_4^{2 - }

{\mathrm{H}^ + }