A) $ [PO_4^{-}][HPO_4^{2-}] $
B) $ [PO_3^{3-}][[H_2PO_4^{-}] $
C) $ [HPO_4^{-}][H_2PO_4^{-}] $
D) All of these are correct.
Correct Answer: B
[Normal salt + conjugate acid] is a buffer solution.
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