Chemistry · p-Block Elements (Group 15-18)

JEE Advanced 2021 — Paper 2 — Question 14

The correct statement(s) related to oxoacids of phosphorous is(are)

Option A:
Upon heating, $\mathrm{H}_{3} \mathrm{PO}_{3}$ undergoes disproportionation reaction to produce $\mathrm{H}_{3} \mathrm{PO}_{4}$ and $\mathrm{PH}_{3}$ .
Correct
Option B:
While $\mathrm{H}_{3} \mathrm{PO}_{3}$ can act as reducing agent, $\mathrm{H}_{3} \mathrm{PO}_{4}$ cannot.
Correct
Option C:
$\mathrm{H}_{3} \mathrm{PO}_{3}$ is a monobasic acid.
Option D:
The H atom of $\mathrm{P}-\mathrm{H}$ bond in $\mathrm{H}_{3} \mathrm{PO}_{3}$ is not ionizable in water.
Correct

Answer: A, B, D

Step-by-step solution

$\mathrm{H}_{3} \mathrm{PO}_{3} \xrightarrow{\Delta} \mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{PH}_{3}$ $\mathrm{P}-\mathrm{H}$ bond is responsible for it is reducing character, $\mathrm{H}_{3} \mathrm{PO}_{4}$ doesnot have. $\mathrm{H}_{3} \mathrm{PO}_{3}$ is a dibasic acid in oxyacids of phosphors $\mathrm{O}-\mathrm{H}$ bond is ionisalbe where as $\mathrm{P}-\mathrm{H}$ bond is non ionizable.

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Exam: JEE Advanced 2021
Paper: Paper 2
Subject: Chemistry
Chapter: p-Block Elements (Group 15-18)
Topic: Compounds of other Group 15 elements - preparation and properties

Ozonolysis of ClO 2 produces an oxide of chlorine. The average oxidation state of chlorine in this oxide is

Answer: A, B, D

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