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HCl was passed through a solution of CaCl2, MgCl2, and NaCl. Which of the following compound(s) crystallise(s)?

1. Only NaCl
2. Only MgCl2
3. NaCl, MgCl2 and CaCl2
4. Both MgCl2 and CaCl2

Correct answer: Only NaCl

Solution

When HCl is passed through the solution, NaCl crystallizes because it is less soluble in concentrated HCl compared to MgCl2 and CaCl2, which remain dissolved due to their higher solubility.

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