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  4. Which oxide of manganese is amphoteric?

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Q. Which oxide of manganese is amphoteric?

ManipalManipal 2014

Solution:

$MnO _{2}$ is amphoteric oxide. It has $Mn$ in $+4$ oxidation state.
It reacts with acid as well as base.
$Mn _{2} O _{7}$ is acidic oxide. It has $Mn$ in $^{+} 7$ oxidation state (highest oxidation state).
It has covalency with covalently bound $O$ atoms.
$MnO$ is basic oxide. It has $Mn$ in $^{+} 2$ oxidation state (low oxidation state).
It is ionically bound oxide.