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How will you prepare orthophosphoric acid from phosphorous?

Answer»

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Solution :Whenphosphorous is treated with conc. Nitric acid it is oxidised to orthophosphoric acid.
This reaction is catalysed by iodine CRYSTALS.
`P_(4)+20HNO_(3)OVERSET(I_(2))underset("(ortho phosphorous acid)")rarr 4H_(3)PO_(4)+20NO_(2)+4H_(2)O`


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