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In the equilibrium  $ HClO‌‌_4+H‌‌_2O $ $\rightleftharpoons$ $ H_2O^+$+$ClO_4^ - $

• A
  $HCl{O_4}$ is the conjugate acid of ${H_2}O$
• B
  ${H_2}O$ is the conjugate acid of ${H_3}{O^ + }$
• C
  ${H_3}{O^ + }$is the conjugate base of ${H_2}O$
• ✓
  $ClO_4^ - $ is the conjugate base of $HCl{O_4}$