The conjugate base of \( \mathrm{H}_{2} \mathrm{PO}_{4}^{-} \)is : (a) \( \mathrm{H}_{3} \mathrm...

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The conjugate base of \( \mathrm{H}_{2} \mathrm{PO}_{4}^{-} \)is :
(a) \( \mathrm{H}_{3} \mathrm{PO}_{4} \)
(b) \( \mathrm{H}_{2} \mathrm{PO}_{4}^{-} \)
(c) \( \mathrm{HPO}_{4}^{2-} \)
(d) \( \mathrm{PO}_{4}^{3-} \)
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