\( \mathrm{HCl} \) was passed through a solution of \( \mathrm{CaCl}_{2}, \mathrm{MgCl}_{2} \) a...

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\( \mathrm{HCl} \) was passed through a solution of \( \mathrm{CaCl}_{2}, \mathrm{MgCl}_{2} \) and \( \mathrm{NaCl} \). Which of the following compound(s) crystallise(s)?
(a) Both \( \mathrm{MgCl}_{2} \) and \( \mathrm{CaCl}_{2} \)
(b) Only \( \mathrm{NaCl} \)
(c) Only \( \mathrm{MgCl}_{2} \)
(d) \( \mathrm{NaCl}, \mathrm{MgCl}_{2} \) and \( \mathrm{CaCl}_{2} \)
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