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Question

Fe2+Fe3++e; MnO4+5eMn2+, the ratio of stoichiometric coefficient of Fe2+ and MnO4 in the balanced redox reaction is:

A
1 : 5
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B
5 : 1
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C
2 : 3
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D
6 : 1
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Solution

The correct option is C 5 : 1
Fe2+Fe3++e ------ 1 electron is lost in the reaction
MnO4+5eMn2+ ----- 5 electrons are gained in this reaction
So the ratio of the stoichiometric coefficient of Fe2+ and MnO4 is 5:1 when the redox reaction occurs between them.
5Fe2++MnO4+8H+5Fe3++Mn2++4H2O

Hence option B is correct.

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