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HCl was passed through a solution of $CaCl_2$, $MgCl_2$ and NaCl. Which of the following compound(s) crystallise(s)?
A
Only NaCl
B
Only $MgCl_2$
C
NaCl, $MgCl_2$ and $CaCl_2$
D
Both $MgCl_2$ and $CaCl_2$
Detailed Solution
$CaCl_2$ and $MgCl_2$ are more soluble than NaCl.
On passing HCl gas, the concentration of $Cl^-$ ions increases (common ion effect), so the ionic product of NaCl exceeds its solubility product and only NaCl crystallises out.