Which of the following equations is a balanced one ?

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5 BiO3- + 22H+ + Mn2+ → 5Bi3+ + 7H2O + MnO4-

5 BiO3- + 14H+ + 2Mn2+ → 5Bi3+ + 7H2O + 2MnO4-

2 BiO3- + 14H+ + Mn2+ → 2Bi3+ + 2H2O + MnO4-

6 BiO3- + 12H+ + 3Mn2+ → 6Bi3+ + 6H2O + 3MnO4-

answer is B.

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Detailed Solution

Bi+5O3- + Mn+2 → Bi+3 + Mn+7O4-Change in oxidation state of ‘Bi’ = 2Change in oxidation state of ‘Mn’ = 5According to oxidation number method , (change in oxidation states are cross multiplied)5 BiO3- + 2Mn2+ → 5Bi3+ + 2MnO4-Balance H and O atoms5 BiO3- + 14H+ + 2Mn2+ → 5Bi3+ + 7H2O + 2MnO4-

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