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Question

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

A
NaCl, MgCl2 and CaCl2
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B
Only NaCl
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C
Only MgCl2
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D
Both MgCl2 and CaCl 2
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Solution

The correct option is B Only NaCl
When HCl is passed through the mixture Cl ion concentration increases.
Thus, ionic product [Na+][Cl] becomes higher than solubility product.
So, NaCl will precipitate out.

Filtrate HCl gas passed−−−−−−−−Pure NaCl (common ion effect)

The hydration energies of group 2 ions are four or five times greater than group 1 ions.
Thus, calcium and magnesium chloride being more soluble than NaCl will remain in the solution.

Hence, option (a) is correct.

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