NEET | 2018Redox and Equivalent ConceptHard

Question

For the redox reaction

MnO4-+C2O42+H+→Mn2++CO2+H2O

the correct coefficients of the reactants for the balanced equation are

Options

A.

MnO4-       C2O42-       H+

16             5             2

B.

MnO4-       C2O42-       H+

  2             5            16 

C.

MnO4-       C2O42-       H+

 2              16            5

D.

MnO4-       C2O42-       H+

  5             16           2

Solution

Mn(+7)O4-→Mn+2 ,5e- gain                     (1)C2(+3)O4-2→CO2(+4),2e-  loss                       (2)
multiplying (1) by 2 and (2) by 5 to balance e–
2MnO4-+5C2O4-2→2Mn+2+10CO2
on balancing charge;
2MnO4-+5C2O4-2+16H+→2Mn+2+10CO2+8H2O

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