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

Question

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

Answer ( 1 )
Sol. Since CaCl2 and MgCl2 are more soluble than NaCl, on passing HCl(g) through a solution containing CaCl2 , MgCl2 and NaCl then NaCl crystallizes out.

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