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Phosphorus

In organic co...

Question

In organic compounds, phosphorus is estimated as :

A

M g_{2} P_{2} O_{7}

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B

M g (N H_{4}) P O_{4}

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C

M g_{3} (P O_{4})_{2}

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D

H_{3} P O_{4}

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Solution

The correct option is A $M g_{2} P_{2} O_{7}$
Phosphorus can also be estimated by precipitating it as $M g N H_{4} P O_{4}$ by adding magnesia mixture, which on ignition yields ${M g}_{2} P_{2} O_{7}$ .

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Q. In organic compounds, phosphorus is estimated as:

Q. In the Carius method for the estimation of phosphorus, 0.31 g of an organic compound gave 0.222 g of

M g_{2} P_{2} O_{7}

. The percentage of phosphorus in the organic compound is .

Q. The phosphorus present in an organic compound of mass 0.2 g is oxidized to phosphoric acid by heating with fuming nitric acid. The phosphoric acid so obtained is precipitated as

M g N H_{4} P O_{4}

, which on ignition is converted into

M g_{2} P_{2} O_{7}

. If the mass of

M g_{2} P_{2} O_{7}

is 0.1 g, the percentage composition of phosphorus present in the sample of the organic compound is:

Q. The phosphorus present in an organic compound of mass 10 g is oxidized to phosphoric acid by heating with fuming nitric acid. The phosphoric acid so obtained is precipitated as

M g N H_{4} P O_{4}

, which on ignition is converted into

M g_{2} P_{2} O_{7}

. If the mass of Mg2P2O7 is 5 g, the percentage composition of phosphorus present in the sample of the organic compound is:

Q. The phosphorus present in an organic compound of mass 30 g is oxidized to phosphoric acid by heating with fuming nitric acid. The phosphoric acid so obtained is precipitated as

M g N H_{4} P O_{4}

, which on ignition is converted into

M g_{2} P_{2} O_{7}

. If the percentage composition of phosphorus present in the sample of the organic compound is 14 percent, find the approximate mass of

M g_{2} P_{2} O_{7}

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