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:

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Step 1: Understand the Test for Phosphorus Detection

Phosphorus detection involves these steps:
1. The organic compound is oxidised with an oxidising agent (e.g.,  or fuming )
2. Phosphorus is converted to phosphate: 
3. The solution is treated with dilute  (to acidify)
4. Ammonium molybdate  is added

Step 2: The Reaction

The yellow precipitate formed is ammonium phosphomolybdate:

Step 3: Identify the Correct Formula

(a)  ❌ — Sodium is not present in this test; the reagent is ammonium mo

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