Which is not an acid salt [MNR 1989]

1.	Which is not an acid salt [MNR 1989]
A.	\[Na{{H}_{2}}P{{O}_{3}}\]
B.	\[Na{{H}_{2}}P{{O}_{2}}\]
C.	\[N{{a}_{3}}H{{P}_{2}}{{O}_{6}}\]
D.	\[N{{a}_{4}}{{P}_{2}}{{O}_{7}}\]
Answer» E.

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Which is not an acid salt [MNR 1989]

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