Tamilnadu BoardEnglish MediumSTD 12ChemistryIonic Equilibrium1 Mark
MCQ
$H _2 PO _4^{-}$ the conjugate base of ____________.
A
$PO _4^{3-}$
B
$P_2O-5$
✓
$H_3PO_4$
D
$HPO _4^{2-}$
✓
Answer
Correct option: C.
$H_3PO_4$
$H _2 PO _4^{-}$the conjugate base of $\underline{H}_3 PO _4$.
Explanation:
$\underset{\text { acid 1 }}{ H _3 PO _4}+\underset{\text { base 1 }}{ H }- OH \rightleftharpoons \underset{\text { acid 2 }}{ H _3 O ^{+}}+\underset{\text { base }}{ H _2 PO _4^{-}}$
$\therefore H _2 PO _4^{-}$is the conjugate base of $H _3 PO _4$
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