Q.

In phosphorus detection of an organic compound, the oxidised phosphorus compound solution is boiled with nitric acid and then treated with ammonium molybdate. Yellow colour is due to the formation of

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a

NH43PO3·MoO3

b

NH43PO4·12MoO3

c

Na4MoNH43·PO3

d

None of these

answer is B.

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Detailed Solution

Na3PO4+3HNO3⟶H3PO4+3NaNO3H3PO4+12NH42MoO4+21HNO3⟶NH43PO4·12MoO3+21NH4NO3+12H2O                                                                    Ammonium phosphomolybdate
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In phosphorus detection of an organic compound, the oxidised phosphorus compound solution is boiled with nitric acid and then treated with ammonium molybdate. Yellow colour is due to the formation of