undergoes disproportionation reaction in acidi medium but 
does not
A
due to the highest oxidation state of 
in 
.
in .
B
due to the highest oxidation state of 
in 
.
in .
C
due to the exothermic nature of disproportionation reaction.
D
due to the endothermic nature of disproportionation reaction.
Text Solution
Verified by ExpertsThe correct answer is:
B
In its compounds, manganese exhibits oxidation states from +2 to +7 .
In 
is in highest oxidation state that is +7 . Thus, here manganese cannot undergo oxidation that is why disproportionation is not possible whereas, in 
is in +6 oxidation state which can be oxidised as well as reduced.
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