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Byju's Answer

Standard XII

Chemistry

Nitrous Acid

Assertion :St...

Question

Assertion :Statement $-$ 1 : $P C l_{3}$ on hydrolysis gives $H_{3} P O_{3}$ Reason: Statement $-$ 2 : $H_{3} P O_{3}$ exists in two tautomeric forms :

Statement

-

1 is true

Statement

-

2 is true

Statement

-

2 is correct explanation for Statement

-

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Statement

-

1 is true

Statement

-

2 is true

Statement

-

2 is not the correct explanation for Statement

-

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Statement

-

1 is true

Statement

-

2 is false.

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Statement

-

1 is false

Statement

-

2 is true.

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Solution

The correct option is B Statement $-$ 1 is true
Statement $-$ 2 is true
Statement $-$ 2 is not the correct explanation for Statement $-$ 1.

The hydrolysis of phosphorus trichloride gives phosphorus acid.
$P C l_{3} + 3 H_{2} O \to H_{3} P O_{3} + 3 H C l$
Thus the statement-1 is correct.
It exists in two tautomeric forms.
$P (O H)_{3}$ is the minor tautomer and $H_{3} P O_{3}$ is the major tautomer.
Thus the statement-2 is correct.
But the statemetn-2 is not the correct explanation of statement -1.

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Assertion :Statement − 1 : PCl3 on hydrolysis gives H3PO3 Reason: Statement − 2 : H3PO3 exists in two tautomeric forms :

Assertion :Statement $-$ 1 : $P C l_{3}$ on hydrolysis gives $H_{3} P O_{3}$ Reason: Statement $-$ 2 : $H_{3} P O_{3}$ exists in two tautomeric forms :