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A blackish brown coloured solid ‘A’ when fused with alkali metal hydroxide in presence of air, produces a dark green coloured compound ‘B’ which on electrolytic oxidation in alkaline medium gives a dark purple coloured compound C. Identify A,B and C and write the reactions involved

A blackish brown coloured solid ‘A’ when fused with alkali metal hydroxide in presence of air, produces a dark green coloured compound ‘B’ which on electrolytic oxidation in alkaline medium gives a dark purple coloured compound C. Identify A,B and C and write the reactions involved

Grade:Upto college level

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
6 years ago
A=MnO2(BLACKISH)
B=MnO^42-(dark green)
C=MnO4^-(dark purple)

2 MnO2 + 4 KOH + O2 >> 2 K2MnO4 + 2 H2O
THE blackish compound is MnO2 and the dark green is MnO4^2-

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