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Which of the following reactions are disproportionation reactions?
  • A$\ce{Cu^+ \rightarrow Cu^{2+} + Cu}$
  • B$\ce{3NO_4^– + 4H^+ \rightarrow 2MnO_4^– + MnO_2 + 2H_2O}$
  • C$\ce{2KMnO_4 \rightarrow K_2MnO_4 + MnO_2 + O_2}$
  • D$\ce{2MnO_4^– + 3Mn^{2+} + 2H_2O \rightarrow 5MnO_2 +4H^+}$
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