1. Both MgCl ₂ and CaCl ₂ 2. Only NaCl 3. Only MgCl ₂ 4. NaCl, MgCl ₂ and CaCl ₂

Topic: Common ion effect, hydrolysis of salts· Equilibrium

HCl was passed through a solution of CaCl_2, MgCl_2 and NaCl. Which of the following compound(s) crystallise(s) ?

1. Both MgCl\(_2\) and CaCl\(_2\)

2. Only NaCl

3. Only MgCl\(_2\)

4. NaCl, MgCl\(_2\) and CaCl\(_2\)

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

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Answer: 2. Only NaCl

Passing HCl gas raises the \(\mathrm{Cl^-}\) concentration. When the ionic product \([\mathrm{Na^+}][\mathrm{Cl^-}]\) exceeds the solubility product of NaCl (common-ion effect), NaCl crystallises. \(\mathrm{CaCl_2}\) and \(\mathrm{MgCl_2}\) are much more soluble and stay in solution.

Answer: only NaCl, option (2).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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HCl was passed through a solution of CaCl_2, MgCl_2 and NaCl. Which of the following compound(s) crystallise(s) ?

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