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  4. When MnO 2 is heated with PbO 2 and conc. HNO 3, pink colour is obtained due to formation of

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Q. When $MnO _{2}$ is heated with $PbO _{2}$ and conc. $HNO _{3}$, pink colour is obtained due to formation of

ManipalManipal 2020

Solution:

$2 MnO _{2}+4 HNO _{3} \rightarrow 2 Mn \left( NO _{3}\right)_{2}+2 H _{2} O + O _{2}$
$2 Mn \left( NO _{3}\right)_{2}+5 PbO _{2}+6 HNO _{3} \rightarrow \underset{\text { Permanganic acid(violet pink) }}{2 HMnO _{4}}+5 Pb \left( NO _{3}\right)_{2}+2 H _{2} O$