Observe the following stoichiometric equation:
$P_4 + 3 OH^{-} + 3 H_2 O \rightarrow PH_3 + 3 X^{-}$
What is the conjugate acid of $X^{-}$?

  • A
    Phosphorous acid
  • B
    Hypophosphorous acid
  • C
    Phosphoric acid
  • D
    Pyrophosphoric acid

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