Question

The oxidation states not shown by Mn in given reaction is :

\(3Mn O ^{2-}_4 + 4 H ^+ \rightarrow 2MnO^-_4 + Mn O_2 + 2H _2O\)

A. +6 

B. +2 

C. +4 

D. +7 

E. +3 

Choose the most appropriate answer from the options given below : 

(1) D and E only 

(2) B and D only 

(3) A and B only 

(4) B and E only

Answer 1

Correct option is (4) B and E only

In the following reaction

\(3 Mn O ^{2-}_4 + 4 H ^+ \longrightarrow 2Mn O ^- _4 + Mn O_2 + 2H_2O\)

Oxidation state of Mn	Species
+6	\(MnO^{2-}_4\)
+7	\(Mn O ^- _4\)
+4	\(MnO_2\)

So +2 and +3 oxidation state is not shown by Mn.