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Oxyacids of Phosphorus

Which of the ...

Question

Which of the following statements is not true about $H_{3} P O_{2}$ ?

A

It is a tribasic acid

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B

One mole of it is neutralised by

0.5 m o l e

of

C a (O H)_{2}

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C

N a H_{2} P O_{2}

is not an acidic salt

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D

It disproportionates to

H_{3} P O_{3}

and

P H_{3}

on heating

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Solution

The correct option is A It is a tribasic acid
$H_{3} P O_{2}$ is a mono basic acid as it has only one replacable hydrogen.
It is not a tribasic acid.
Hence option A is correct.

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Similar questions

Q. Equivalent weight of

H_{3} P O_{2}

when it disproportionates into

P H_{3}

H_{3} P O_{3}

Q. Assertion :Both

H_{3} P O_{3}

H_{3} P O_{4}

have the same number of hydrogen atoms but

H_{3} P O_{4}

is a tribasic acid and

H_{3} P O_{3}

is a dibasic acid Reason: 1 mole of

H_{3} P O_{3}

is neutralised by 2 moles of

N a O H

while 1 mole of

H_{3} P O_{4}

is neutralised by 3 moles of

N a O H

.

Q. Equivalent mass of

H_{3} P O_{2}

when it disproportionate into

P H_{3}

H_{3} P O_{3}

Q. Equivalent mass of

H_{3} P O_{2}

= 66

) when it disproportionates into

P H_{3}

H_{3} P O_{3}

Q. Equivalent weight of

H_{3} P O_{2}

when it disproportionates into

P H_{3}

H_{3} P O_{3}

M

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