Assuming complete ionisation same moles of which of the following compounds

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

Options

(a) FeSO₃
(b) FeC₂O₄
(c) Fe(NO₂)₂
(d) FeSO₄

Correct Answer:

FeSO₄

Explanation:

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