Chemistry · Practical Inorganic chemistry (Qualitative Analysis)

JEE Main 2024 — 5 April, Shift 2 — Question 61

While preparing crystals of Mohr's salt, dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added here to:

Option A:
prevent the hydrolysis of ferrous sulphate
Correct
Option B:
prevent the hydrolysis of ammonium sulphate
Option C:
make the medium strongly acidic
Option D:
increase the rate of formation of crystals

Answer: A

Step-by-step solution

$\mathrm{Fe}^{+2}$ ions undergoes hydrolysis, therefore while preparing aqueous solution of ferrous sulphate and ammonium sulphate

in water dilute sulphuric acid is added to prevent hydrolysis of ferrous sulphate

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 5 April, Shift 2
Subject: Chemistry
Chapter: Practical Inorganic chemistry (Qualitative Analysis)
Topic: Introduction to Qualitative Analysis + Preliminary Tests - Dry Tests