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Oxides and Oxoanions

Which of the ...

Question

Which of the following is the composition of the yellow precipitate obtained in the test for phosphates using ammonium molybdate?

A

(N H_{4})_{3} [P M o_{12} O_{40}]

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B

(N H_{4})_{3} [P M o_{12} O_{36}]

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C

(N H_{4})_{3} P O_{4} .10 M o O_{3}

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D

(N H_{4})_{3} P O_{4} .14 M o O_{3}

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Solution

The correct option is D $(N H_{4})_{3} [P M o_{12} O_{40}]$
$P O_{4}^{3 -} + 3 N H_{4}^{+} + 12 M o O_{4}^{2 -} + 24 H^{+} \to (N H_{4})_{3} [P M o_{12} O_{40}] Canary-Yellow ppt. ↓ + 12 H_{2} O$

Option A is correct.

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Q. Assertion :Phosphates give a yellow crystalline precipitate upon addition of nitric acid and ammonium molybdate. Reason: Phosphates shows no change with

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