The strongest acid is

Options

A. `H_(3)AsO_(4)`
B. `H_(3)AsO_(3)`
C. `H_(3)PO_(3)`
D. `H_(3)PO_(4)`

Answer

D

Explanation

On increasing of oxidation number of central atom, acid strength increases . So `H_(3)"AsO"_(4) gt H_(3)"sO"_(3) and H_(3)PO_(4) gt H_(3)PO_(3) ` . On increasing size of the central atom, acid strength decreases. So `H_(3)PO_(4) gt H_(3)"AsO"_(4)` .