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Assuming complete ionization, same moles...

Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified `KMnO_4` for complete oxidation

A

`FeSO_4`

B

`FeSO_3`

C

`FeC_2O_4`

D

`Fe(NO_2)_2`

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The correct Answer is:
A
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