Question

Canary yellow ppt. of ammonium phosphomolybdate indicates the presence of _____ radical.

a) Cl- b) So4 2- c) Po4 3- d) No3-

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Answer 1

Answer:

a)cl-

Explanation:

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Answer 2

Answer:

The ammonium phosphomolybdate's canary yellow precipitate indicates the presence of phosphate ( $PO_{4}^{3-}$ ) radical.

Therefore, option c)  $PO_{4}^{3-}$ is correct.

Explanation:

The ammonium phosphomolybdate's canary yellow precipitate indicated the presence of _______ radical.

As we know,

• The chemical formula of ammonium phosphomolybdate is $(NH_{4})_{3}[PMo_{12}O_{40}]$.

Now,

• When ammonium molybdate ( $(NH_{4})_{2} MoO_{4}$ ) reacts with the solution containing phosphate radical in the presence of nitric acid, the ammonium phosphomolybdate's canary yellow precipitate is formed along with the side products ammonium nitrate and water.

The reaction of ammonium molybdate with phosphate radical follows as:

$H_{3}PO_{4} + 12(NH_{4})_{2} MoO_{4} + HNO_{3} \rightarrow (NH_{4})_{3}[PMo_{12}O_{40}] + 21NH_{4}NO_{3} + 12H_{2}O$

Hence, the ammonium phosphomolybdate's canary yellow precipitate indicates the presence of phosphate ( $PO_{4}^{3-}$ ) radical.