In the equilibrium $HClO_4 + H_2O \rightleftharpoons H_3O^{+} + ClO_4^-$,which of the following statements is correct?

  • A
    $HClO_4$ is the conjugate acid of $H_2O$
  • B
    $H_2O$ is the conjugate acid of $H_3O^{+}$
  • C
    $H_3O^{+}$ is the conjugate base of $H_2O$
  • D
    $ClO_4^-$ is the conjugate base of $HClO_4$

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