Which of the following is a disproportionation reaction?

  • A
    $Cu_2O + 2H^{+} \to Cu + Cu^{2+} + H_2O$
  • B
    $2CrO_4^{2-} + 2H^{+} \to Cr_2O_7^{2-} + H_2O$
  • C
    $CaCO_3 + 2H^{+} \to Ca^{2+} + H_2O + CO_2$
  • D
    $Cr_2O_7^{2-} + 2OH^{-} \to 2Cr_2O_4^{2-} + H_2O$

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