When $HClO_4$ is dissolved in the weak acid $HF$,the following equilibrium is established:
$HF + HClO_4 \rightleftharpoons H_2F^+ + ClO_4^-$
Which of the following is the correct set of conjugate acid-base pairs?

  • A
    $HF$ and $ClO_4^-$
  • B
    $HClO_4$ and $H_2F^+$
  • C
    $HF$ and $H_2F^+$
  • D
    $HClO_4$ and $ClO_4^-$

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