The conjugate base of \( \mathrm{H}_{2} \mathrm{PO}_{4} \) - is : (...

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The conjugate base of \( \mathrm{H}_{2} \mathrm{PO}_{4} \) - is :
(1) \( \mathrm{PO}_{4}{ }^{3-} \)
(2) \( \mathrm{P}_{2} \mathrm{O}_{5} \)
(3) \( \mathrm{H}_{3} \mathrm{PO}_{4} \)
(4) \( \mathrm{HPO}_{4}{ }^{2-} \)
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