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a
K2MnO4
b
MnOH2
c
MnO2
d
Mn2+
answer is C.
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Detailed Solution
KMnO4is first reduced to manganate and then to insoluble manganese dioxide. Colour changes first from purple to green and finally becomes colourless.2KMnO7+2KOH→2K2MnO4+H2O+O2KMnO4+2H2O→2MnO4+4KOH+2O2KMnO2+H2O→alkaline2MnO2+2KOH+3O