For `H_3 PO_3` and `H_3 PO_4`, the correct choice is

For H_3PO_4 and H_3PO_3 the correct choice is:

For H_(2)PO_(3) and H_(3)PO_(4) the correct choice is :

Basicity of H_3 PO_4 and H_3 PO_3 are

Basicity of H_3 PO_4 and H_3 PO_3 are

The number of P - H bonds (s) in H_(3)PO_(2), H_(3)PO_(3) and H_(3)PO_(4) , respectively, is

Basicity of H_3PO_2, H_3PO_3 and H_3PO_4 is not the same. Explain

Statement: H_(3)PO_(3) is dibasic and H_(3)PO_(4) s tribasic acid. H_(3)PO_(3) and H_(3)PO_(4) on reacting with D_(2)O gives HD_(2) PO_(3) and D_(3)PO_(4) respectively.