NEET UG CHEMISTRY MCQ: REDOX REACTIONS

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In which reaction there is no change in valency and the oxidation state?

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Correct option: C

N{a_2}{O_2} + {H_2}S{O_4} \to N{a_2}S{O_4} + {H_2}{O_2}

Option C (Na2O2 + H2SO4 → Na2SO4 + H2O2) is correct because the oxidation states of all elements remain unchanged in this reaction.

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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}^ + }