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  4. When a manganous salt is fused with a mixture of KNO3 and solid NaOH the oxidation number of Mn changes from +2 to

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Q. When a manganous salt is fused with a mixture of $KNO_3$ and solid $NaOH$ the oxidation number of $Mn$ changes from $+2$ to

WBJEEWBJEE 2010Redox Reactions

Solution:

$\overset{(+2)}{Mn ^{+2}}+ NO _{3}^{-}+ OH ^{-} \longrightarrow \overset{(+6)}{MnO _{4}^{-2}}+ H _{2} O$