Answer:
In\[MnO_{4}^{-}\], manganese is
in its highest oxidation state (+7)hence it will not undergo
disproportionation. However,\[MnO_{4}^{2-}\] ion will undergo
disproportionation in acid medium.
\[\overset{(+6)}{\mathop{2MnO_{4}^{2-}}}\,+4{{H}^{+}}\to
2\overset{(+7)}{\mathop{MnO_{4}^{-}}}\,+\overset{(+4)}{\mathop{Mn{{O}_{2}}}}\,+2{{H}_{2}}O\]
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