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7. Redox reactions — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry7. Redox reactions1 Mark
MCQ
For the redox reaction $MnO_4^ - + {C_2}O_4^{ - 2} + {H^ + } \to \,M{n^{2 + }} + C{O_2} + {H_2}O$ the correct coefficients of the reactants for the balanced reaction are

$MnO_4^ - $               ${C_2}O_4^{2 - }$             ${H^ + }$

  • ✓
    $2$                 $5$                 $16$
  • B
    $16 $                $5$                 $ 2$
  • C
    $5$                 $16$                $2$
  • D
    $2$                 $16$               $5$
✓

Answer

Correct option: A.
$2$                 $5$                 $16$
(a) $MnO_4^ - + 8{H^ + } + 5{e^ - } \to M{n^{2 + }} + 4{H_2}O \times 2$

${C_2}O_4^{2 - } \to 2C{O_2} + 2{e^ - } \times 5$

$\overline{2MnO_4^ - + 5{C_2}O_4^{2 - } + 16{H^ + } \to 2M{n^{2 + }} + 10C{O_2} + 8{H_2}O} $

Thus the coefficient of $MnO_4^ - $, ${C_2}O_4^{2 - }$and${H^ + }$in the above balanced equation respectively are  $2, 5, 16.$

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