In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The ye

Question

In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is :

(A) 4 Na PO .12MoO
(B) 4 4 2 NH PO .12 NH MoO
(C) 4 3 NH PO .12MoO
(D) 4 MoPO .21NH NO

Prashant Kotian · Accepted Answer

Correct answer: C. PO4 3– Or HPO4 – + (NH4)2MoO4 Ammonium Molybdate (NH4)3PO4.12MoO3  Canary yellow ppt. (Ammonium phopho molybdate) H+

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