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

A

Orthophosphorous and hypophosphoric acids

B

Pyrophosphorous and pyrophosphoric acids

C

Orthophosphorous and pyrophosphorous acids

D

Pyrophosphorous and hypophosphoric acids

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The correct Answer is:C

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 $H_{3} P O_{3} + 3$
Hypophosphoric acid $H_{4} P_{2} O_{6} + 4$ .

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Updated on:21/07/2023

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