On heating $Mn(OH)_2$ with $PbO_2$ and conc. $HNO_3$,a pink colour is obtained due to the formation of:

  • A
    $HMnO_4$
  • B
    $H_2MnO_4$
  • C
    $Pb(MnO_4)_2$
  • D
    $PbMnO_4$

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