Discussion
The formula of Ammonium phosphomolybdate is
Answer: A
The formula is \((NH_{4})_{3}PO_{4}.12MoO_{3}\).
Ammonium phosphomolybdate is the canary-yellow precipitate formed when a phosphate is warmed with nitric acid and ammonium molybdate; it is the confirmatory test for phosphorus. Its formula contains one phosphate, three ammonium ions and twelve \(MoO_{3}\) units.
The other formulas change the number of ammonium ions (2), the phosphorus species (\(PO_{3}\)), the molybdenum count (2), or omit phosphorus entirely.
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