JEE Main 2019 Chemistry question
In order to oxidise a mixture of one mole of each of FeCO, Fe(CO), FeSO and Fe(SO) in acidic medium, the number of moles of KMnO required is:
Answer: (A)
Solution
Electrons lost: FeCO 3, Fe(CO) 6, FeSO 1, Fe(SO) 0 ⇒ 10 e; KMnO takes 5 e each ⇒ 2 mol.