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JEE Main 202225 JuneEvening Shift

Exam: JEE Main
Year: 2022
Date: 25 June
Shift: Evening Shift
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2022 · 25 June · Evening Shift · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

PCl _ 5 + H _ 2 O → A + HCl A + H _ 2 O → B + HCl Find number of...

${PCl}_{5} + {H}_{2}O \to A + HCl$

$A + {H}_{2}O \to B + HCl$

Find number of ionisable hydrogen in $B$

Correct answer

3

Step-by-step solution

${PCl}_{5}$ is a yellowish white powder and in moist air, it hydrolyses into ${POCl}_{3}$ and finally gets converted to phosphoric acid.

${PCl}_{5} + {H}_{2}O \to {POCl}_{3} + 2HCl$

${POCl}_{3} + 3{H}_{2}O \to {H}_{3}{PO}_{4} + 3HCl$

Phosphoric acid has 3 ionisable hydrogen atoms.

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