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

Options

A. Orthophosphorous and hypophosphoric acids
B. Pyrophosphorous and pyrophosphoric acids
C. Orthophosphorous and pyrophosphorous acids
D. Pyrophosphorous and hypophosphoric acids

Answer

C

Explanation

Phosphorous acid contain P in `+3` oxidation state.
Acid Formala Oxidation state of Phosphorous
Pyrophosphorous acid `H_(4)P_(2)O_(5)" "+3`
Pyrophosphoric acid `H_(4)P_(2)O_(7)" "+5`
Orthophosphorous acid `H_(3)PO_(3)" "+3`
Hypophosphoric acid `H_(4)P_(2)O_(6)" "+4`.