Phosphorus has the oxidation state of +3 in:

ortho phosphoric acid

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phosphorus acid

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meta phosphoric acid

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pyrophosphoric acid

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Solution

The correct option is B phosphorus acid
Orthophosphoric acid is $H_{3} P O_{4}$
Refer to image 01
Here, oxidation state of $P$ is $+ 5$
Phosphorous acid is $H_{3} P O_{3}$
Refer to Image 02
Here oxidation state of $P$ is $+ 3$

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What is the oxidation number of phosphorus in phosphoric acid ( $H_{3} P O_{4}$ )?

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