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When HCl is passed through the solution Cl⁻ ion concentration increases. Hence ionic product becomes more than solubility product. Only NaCl is crystallised due to less solubility than MgCl₂ and CaCl₂.

1. NaCl
2. MgCl₂
3. CaCl₂
4. None of these

Correct answer: NaCl

Solution

When HCl is added, the common ion effect increases the Cl⁻ ion concentration, leading to the ionic product exceeding the solubility product. NaCl, being the least soluble among the given salts, crystallizes out first.

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