In the test for the detection of phosphorous present in an organic compound, which of the following compound is yellow colour or precipitate?

Ammonium phosphomolybdate

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Sodium phosphate

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phosphoric acid

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ammonium phosphate

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Solution

The correct option is A Ammonium phosphomolybdate
In the test for the detection of phosphorous present in an organic compound, yellow precipitate or colour is due to ammonium phosphomolybdate.
It is formed during following reaction.
$N a_{2} H P O_{4} + (N H_{4})_{2} M o O_{4} + H N O_{3} \to (N H_{4})_{3} P O_{4} \cdot 12 M o O_{3}$

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