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Question

For the detection of phosphorus, the organic compound after fusion with Na2O2 is extracted with water, boiled with HNO3 and then ammonium molybdate added to it. A yellow precipitate is obtained which is due to the formation of:

A
ammonium phosphate
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B
ammonium phosphomolybdate
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C
ferric phosphate
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D
disodium ammonium phosphate
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Solution

The correct option is B ammonium phosphomolybdate
Correct answer : (B)
Na3PO4+3HNO3H3PO4+3NaNO3

H3PO4+12(NH4)2MoO4Ammonium Molybdate+21HNO3(NH4)3PO412MoO3Ammonium Phospho Molybdate+21NH4NO3+12H2O

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