[CPMT 1976]
A) 1
B) 2
C) 3
D) 4
Correct Answer: C
$ H_3PO_4{{H}^{+}}+H_2PO_4^{-} $ ⇌ $ {{H}^{+}}+H_2PO_4^{-} $ $ H_2PO_4^{-} $ ⇌ $ {{H}^{+}}+HPO_4^{2-} $ $ HPO_4^{2-} $ ⇌ $ {{H}^{+}}+PO_4^{3-} $
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