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Hydrochloric Acid

The number of...

Question

The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is:

A

3

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B

1

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C

0

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D

2

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Solution

The correct option is D 2
Reaction of phosphorus trichloride and phosphonic acid gives pyrophosphorous acid.

$P C l_{3} + H_{3} P O_{3} + 2 H_{2} O \to H_{4} P_{2} O_{5} pyrophosphorous acid + 3 H C l$

The structure of pyrophosphorous acid shows that it has two acidic or ionisable hydrogen.

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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}

The number of hydrogen atoms attached to phosphorous atom in hypo phosphorus acid is

Q. Concentrate nitric acid oxidises phosphorus to phosphoric acid according to the following equation:

P + 5 H N O_{3} (c o n c .) \to H_{3} P O_{4} + H_{2} O + 5 N O_{2}

9.3 g

of phosphorus was used in the reaction, calculate:
The mass of phosphoric acid formed.

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