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Question

Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation?

A
FeC2O4
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B
Fe(NO2)2
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C
FeSO4
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D
FeSO3
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Solution

The correct option is C FeSO4
All of these compounds have the same positive ion Fe2+, which will get oxidised to Fe3+. So, the compound where the anion does not get oxidised by KMnO4 would require the least amount to get oxidised completley.
C2O24CO2
NO2NO3
SO23SO24
Since SO24 has S in the highest oxidation state already, the answer would be FeSO4

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