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CHEMISTRY

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Which of the following is the conjugate acid to a base in these options :
1) PO4^-3
2) H2O
3) H3PO4
4) H2PO4^-

  • CHEMISTRY -

    I don't understand the question.
    1 is the conjugate base of HPO4^2-.
    2 is the conjugate base of H3O^+.
    3 is the conjugate acid of H2PO4^-
    4 is the conjugate acid of HPO4^2- and the conjugate base of H3PO4.

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