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

HCl was passed through a solution of CaCl2 MgCl2 and NaCl. Which of the following compound(s) crystallise(s) ? (1) NaCl MgCl2 and CaCl2 (2) Both MgCl2 and CaCl2 (3) Only NaCl (4) Only MgCl2

(3) Only NaCl When HCl is passed thorugh the mixture Cl¯ ion concentration increases. Hence ionic product [Na + ] [Cl¯] becomes more than solubility product.  So NaCl will precipitate out. precipitation (common ion effect)

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