Question

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

• A. 4
• B. 3
• C. 6
• D. 7

Answer 1

Answer: (C)

6

Answer 2

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