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Explain about the test for phosphorous i...

Explain about the test for phosphorous in an organic compound.

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(i) A solid organic compound strongly heated with a mixture of `Na_(2)CO_(3)` and `KNO_(3)` . Phosphorous present in the compound is oxidised to sodium phosphate.
(ii) The residue is extracted with water and boiled with conc. `HNO_(3)` . A solution of ammonium molybdate is added to this solution
(iii) A canary yellow precipitate shows the presence of phosphorous.
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