Which among the following acids form one normal salt and one acidic salt?

Options

A. Acetic acid
B. Phosphorous acid
C. phosphoric acid
D. Both (b) and (c)

Answer

B

Explanation

`HPO_3 ^(- 2)` is the ion formed by the dissociation of` H_3PO_3. H 3PO_3` is a dibasic acid and undergoes dissociation as follows. `H_3PO_3 to H_2PO_3- + H^+ H_2PO_3 to HPO_3-^2 + H^+``HPO_3^ -2 `further cannot lose `H^+` ion as hydrogen is not replaceable. Therefore, it can give a normal salt of formula `M_2HPO_3` ,vi.th a monovalent cation. Hence, the correct option is (b).