Brown ppt ,of `MnO(OH)` on boiling with `PbO_(2)` and cone `HNO_(3)` yields a pink colouration on dilution due to the formation

Brown ppt ,of `MnO(OH)` on boiling with `PbO_(2)` and cone `HNO_(3)` yields a pink colouration on dilution due to the formation of
A. `HMnO_(4)`
B. `H_(2)MnO_(4)`
C. `Pb(MnO_(4))_(2)`
D. `PbMnO_(3)`

Brown ppt ,of `MnO(OH)` on boiling with `PbO_(2)` and cone `HNO_(3)` yields a pink colouration on dilution due to the formation of

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