How many moles of \( \mathrm{KMnO}_{4} \) are needed to oxidise a mixture of 1 mole of each \( \...

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How many moles of \( \mathrm{KMnO}_{4} \) are needed to oxidise a mixture of 1 mole of each \( \mathrm{FeSO}_{4} \& \mathrm{FeC}_{2} \mathrm{O}_{4} \) in acidic medium :
(1) \( 4 / 5 \)
(2) \( 5 / 4 \)
(3) \( 3 / 4 \)
(4) \( 5 / 3 \)
\( \mathrm{P} \)
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