1. Tardigrade
  2. Question
  3. Chemistry
  4. On heating Mn(OH)2 with PbO2 and conc. HNO3 pink colour is obtained due to the formation of

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. On heating $ Mn(OH)_{2} $ with $ PbO_{2} $ and conc. $ HNO_{3} $ pink colour is obtained due to the formation of

Chhattisgarh PMTChhattisgarh PMT 2004

Solution:

On boiling red lead or lead dioxide with conc. $HNO _{3}$, they form per manganic acid due to which a deep pink colour is developed.
$2 Mn ^{2+}+5 PbO _{2}+4 H ^{+} \rightarrow 2 MnO _{4}^{-}$ $+5 Pb ^{2+}+2 H _{2}
O$ $2 MnCl _{2}+3 H _{2} O +5 O \rightarrow 2 HMnO _{4}+4 HCl$