1.

The acid which forms two series of salts is

Answer»

`H_(3)PO_(4)`
`H_(3)PO_(3)`
`H_(3)BO_(3)`
`H_(3)PO_(2)^(-)`

SOLUTION :`HO-underset(O)underset(||)overset(OH)overset(|)P-H` it can form two series of SALTS by replacement of H ATTACHED to oxygen


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