The oxidation state of +3 for phosphorous is in :

hypophosphorous acie

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meta-phosphoric acid

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ortho-phosphoric acid

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phosphorous acid

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Solution

The correct option is C phosphorous acid
The oxidation state of +3 for phosphorous is in phosphorous acid.
The oxidation state of P in hypophosphorous acid +1, meta-phosphoric acid +5 and ortho-phosphoric acid +5
is +1, +5 and +5 respectively.

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