The correct formula of Canary yellow ppt. and it is the test of................acid radical.

${\left({\mathrm{NH}}_4\right)}_2{\mathrm{PMo}}_{12}{\mathrm{O}}_{40}$ is also known as canary yellow precipitate and it is the test of phosphate acid radical.

The inorganic salt of phosphomolybdic acid with the formula ${\left({\mathrm{NH}}_4\right)}_2{\mathrm{PMo}}_{12}{\mathrm{O}}_{40}$ is called ammonium phosphomolybdate. The phosphomolybdate ion complex is present in it.