Question

a black brown coloured solid even fused with an alkali metal Hydroxide in the presence of air produces a dark green coloured compound be with up electrolyte oxidation in alkaline medium give a dark purple coloured compounds identify ABC and write the reaction involved

Answer 1

A= MnO2

B= K2 MnO4

C= KMnO4

MnO2 + 4KOH + O2 → K2 MnO4 + 2H2 O

MnO4 2- →(electrolytic oxidation in alkaline solution) MnO4 -
(green)                                                                        (purple)

:) Hope this helps!!!!