2024 Re-NEET Redox ReactionsDisproportionation and oxidation states of manganese Medium Question 5 of 30 in Redox Reactions

The oxidation states not shown by Mn in given reaction is: $3MnO_4^{2-}+4H^+\rightarrow2MnO_4^-+MnO_2+2H_2O$ A. +6 B. +2 C. +4 D. +7 E. +3. Choose the most appropriate answer from the options given below:

A D and E only
B B and D only
C A and B only
D B and E only

The answer is D.

Solution

In this disproportionation reaction, $MnO_4^{2-}$ (Mn is +6) disproportionates into $MnO_4^-$ (Mn is +7) and $MnO_2$ (Mn is +4). So the oxidation states shown are +6, +7 and +4; +2 and +3 are not shown.

Concept Disproportionation and oxidation states of manganese

Redox Reactions in past papers

30 questions from this chapter have appeared across 19 exam years.