The number of moles of KMnO4 that will be needed to react with one mole of ferrous sulphite in acidic solution is
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a
0.6
b
0.4
c
0.8
d
1.0
answer is A.
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Detailed Solution
FeSO3⟶Fe2++SO32−MnO4−oxidises Fe2+ and SO32− both 5Fe2++MnO4−+8H+⟶5Fe3++Mn2++4H2O5SO32−+2MnO4−⟶5SO42−+2Mn2++H2O5FeSO3+3MnO4−⟶5Fe3++5SO42−+3Mn2+5FeSO3≡3MnO4−1FeSO3≡35MnO4−=0.6