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Question

When a mixture containing phosphate is heated with conc.HNO3 and ammonium molybdate solution, a canary yellow precipitate is formed.


The formula of the yellow precipitate is :

A
(NH4)3PO4
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B
(NH4)3PO412MoO4
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C
(NH4)3PO412MoO3
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D
(NH4)3PO4(NH4)2MoO4
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Solution

The correct option is A (NH4)3PO412MoO3
When ammonium molybdate is treated with a solution containing phosphate a canary yellow crystalline precipitate of ammonium phosphomolybdate (ammonium dodecamolybdatophosphate), (NH4)3[PMo12O40] or (NH4)3[P(Mo3O10)4] is formed.

In the compound formed, the Mo3O10 group replaces each oxygen atom in phosphate.


PO34+3NH+4+12MoO24+24H+(NH4)3[P(Mo3O10)4]+12H2OCanaryYellowppt

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