Question

$MnO _{4}^{-}$ is a good oxidising agent in different medium changing to
$MnO _{4}^{-} \longrightarrow Mn ^{2+} $
$ \longrightarrow MnO _{4}^{2-} $
$ \longrightarrow MnO _{2} $
$ \longrightarrow Mn _{2} O _{3}$
Changes in oxidation number respectively are :

• A. 1,3,4,5
• B. 5,4,3,2
• C. 5,1,3,4
• D. 2,6,4,3

Answer 1

Answer: (C)

$\overset{+7}{Mn}O_4^- \rightarrow Mn^{2+}$ change 5

$\rightarrow \overset{+6}{Mn}O_4^{2-}$ change 1

$\rightarrow \overset{+4}{Mn}O_2$ change 3

$\rightarrow \overset{+3}{Mn_2}O_3$ change 4