JEE Main 2023 — Chemistry Inorganic Chemistry

2023mcqhard

Reaction of thionyl chloride with white phosphorus forms a compound $[A]$ , which on hydrolysis gives $[B]$ , a dibasic acid. $[A]$ and $[B]$ are respectively

Official previous-year question

Held on 25 Jan 2023 · Verified 6 Jul 2026.

Options

A
${P}_{4}{O}_{6}$ and ${H}_{3}{\mathrm{PO}}_{3}$
B
${\mathrm{PCl}}_{3}$ and ${H}_{3}{\mathrm{PO}}_{3}$
C
${\mathrm{PCl}}_{5}$ and ${H}_{3}{\mathrm{PO}}_{4}$
D
${\mathrm{POCl}}_{3}$ and ${H}_{3}{\mathrm{PO}}_{4}$

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Solution

Phosphorus trichloride is obtained by the action of thionyl chloride with white phosphorus

${P}_{4}+8{\mathrm{SOCl}}_{2}\rightarrow \underset{[A]}{4{\mathrm{PCl}}_{3}}+4{\mathrm{SO}}_{2}+2{S}_{2}{\mathrm{Cl}}_{2}$

Phosphorus trichloride is a colourless oily liquid and hydrolyses in the presence of moisture give dibasic phosphorus acid.

${\mathrm{PCl}}_{3}+3{H}_{2}O\rightarrow \underset{[B]}{{H}_{3}{\mathrm{PO}}_{3}}+3\mathrm{HCl}$

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JEE Main 2023 — Chemistry Inorganic Chemistry

2023mcqhard

Reaction of thionyl chloride with white phosphorus forms a compound $[A]$ , which on hydrolysis gives $[B]$ , a dibasic acid. $[A]$ and $[B]$ are respectively

Official previous-year question

Held on 25 Jan 2023 · Verified 6 Jul 2026.

Options

A
${P}_{4}{O}_{6}$ and ${H}_{3}{\mathrm{PO}}_{3}$
B
${\mathrm{PCl}}_{3}$ and ${H}_{3}{\mathrm{PO}}_{3}$
C
${\mathrm{PCl}}_{5}$ and ${H}_{3}{\mathrm{PO}}_{4}$
D
${\mathrm{POCl}}_{3}$ and ${H}_{3}{\mathrm{PO}}_{4}$

Did you get this right?

Solution

Phosphorus trichloride is obtained by the action of thionyl chloride with white phosphorus

${P}_{4}+8{\mathrm{SOCl}}_{2}\rightarrow \underset{[A]}{4{\mathrm{PCl}}_{3}}+4{\mathrm{SO}}_{2}+2{S}_{2}{\mathrm{Cl}}_{2}$

Phosphorus trichloride is a colourless oily liquid and hydrolyses in the presence of moisture give dibasic phosphorus acid.

${\mathrm{PCl}}_{3}+3{H}_{2}O\rightarrow \underset{[B]}{{H}_{3}{\mathrm{PO}}_{3}}+3\mathrm{HCl}$

JEE Main 2023 — Chemistry Inorganic Chemistry

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JEE Main 2023 — Chemistry Inorganic Chemistry

Options

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Solution

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JEE Main Inorganic Chemistry in other years

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Physical Chemistry

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