The pair in which phosphours atoms have a formed oxidation state of `+3` is

Options

A. orthophosphorous acid and pyrophosphorous acids
B. pyrophosphorous acid and hypophosphoric acids
C. orthophosphorous and hyphophosphoric acids
D. pyrophosphorous and pyrophosphoric acids

Answer

A

Explanation

The O.S of P is given in the bracket.
`{:("Orthophosphorous acid,"H_(3)PO_(3) (+3)","),("Pyrophosphorous acid," H_(4)P_(2)O_(5)(+3)","),("Hypophosphoric acid,"H_(4)P_(2)O_(6)(+4)and),("Pyrophosphoric acid,"H_(4)P_(2)O_(7)(+5)):}`