Analytical ChemistryHard
Question
In the fourth group, white precipitate of Mn(OH)2 on heating with PbO2 and concentrated HNO3 gives red-violet (purple) colour due to the formation of :
Options
A.HMnO4
B.Mn2O7
C.MnO(OH)2
D.PbMnO4
Solution
Mn(OH)2 + 2HNO3 → Mn(NO3)2 + 2H2O.
2Mn(NO3)2 + 5PbO2 + 6HNO3 → 2HMnO4 (red - violet or purple colour) + 5Pb(NO3)2 + 2H2O.
2Mn(NO3)2 + 5PbO2 + 6HNO3 → 2HMnO4 (red - violet or purple colour) + 5Pb(NO3)2 + 2H2O.
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