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Q.
When phosphate radical react with ammonium molybdate, the colour of precipitate obtained is
NTA AbhyasNTA Abhyas 2020
Solution:
Phosphates give canary yellow precipitate with ammonium molybdate in the presence of conc. HNO $_{3}$
$$
\begin{array}{l}
H _{3} PO _{4}+12\left( NH _{4}\right)_{2} MoO _{4}+21 HNO _{3} \\
\rightarrow\left( NH _{4}\right)_{3} PO _{4} \cdot 12 MoO _{3}+21 NH _{4} NO _{3}+12 H _{2} O
\end{array}
$$
ammonium phosphomolybdate (canary yellow ppt.)