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Question

The colour of ammonium phosphomolybdate is:

A
green
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B
yellow
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C
bhue
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D
colourless
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Solution

The correct option is D yellow

The aqueous mixture is heated with concentrated nitric acid and ammonium molybdate. A yellow precipitate of ammonium phosphomolybdate is produced. This yellow precipitate helps us conclude that Phosphorus was present in the organic compound

$Na_3PO_4+3HNO_3\rightarrow H_3PO_4+3NaNO_3$

$H_3PO_4+12(NH_4)_2MoO_4+21HNO_3\rightarrow (NH_4)_3PO_412MoO_3 (yellow ppt)+21NH_4NO_3+12N_2O$

Hence option B is correct.


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