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

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${({NH}_{4})}_{2} [{PMo}_{12} O_{40}]$ and phosphate

${Na}_{3} [P {({Mo}_{3} O_{10})}_{4}]$ and phosphate

$({NH}_{4}) H [P {({Mo}_{3} O_{10})}_{4}]$ and sulphate

${({NH}_{4})}_{3} [P {({Mo}_{3} O_{10})}_{4}]$ and phosphate

answer is A.

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Detailed Solution

${({NH}_{4})}_{2} {PMo}_{12} O_{40}$ 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 ${({NH}_{4})}_{2} {PMo}_{12} O_{40}$ is called ammonium phosphomolybdate. The phosphomolybdate ion complex is present in it.

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