A solution contains mol of FeCO and mol of FeSO. In acidic medium it is titrated with KMnO (MnO Mn). The volume of KMnO needed is
Answer and explanation
Correct answer: D.
- Step 1: Analyze the oxidation half-reactions in acidic medium. In ferrous oxalate (), oxidizes to () and oxalate oxidizes to (), releasing moles of electrons per mole. In ferrous sulfate (), oxidizes to , releasing mole of electrons.
- Step 2: Calculate the total equivalents of electrons donated: .
- Step 3: In acidic solution, permanganate reduces by electrons: . Hence . The required titrant volume is .
Answer
.
Why not the others: neglects the oxidation of , and erroneously attributes three oxidation electrons to .
Practise more Mole concept.
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