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.
Create a free account to view solution
View Solution FreeMore Analytical Chemistry Questions
Ni + H2SO4 (hot and concentrated) → X(g). The liberated gas (select the correct statement) :...A mixture when rubbed with dilute acid smells like vinegar. It contains :...A coloured solution of a salt gives following reactions.(i) It gives white precipitate with sodium hydroxide which becom...In fifth group, (NH4)2CO3 is added to precipitate out the carbonates. We do not add Na2CO3 because :...When CS2 layer containing both Br2 and I2 (2 : 1) is shaken with excess of chlorine (Cl2) water, the violet colour due t...