HCl was passed through a solution of `CaCl_2, MgCl_2 and NaCl` Which of the following compound(s) crystallise(s) ?

Options

A. Both `MgCl_(2)andCaCl_(2)`
B. Only NaCl
C. Only `MgCl_(2)`
D. `NaCl,MgCl_(2)andCaCl_(2)`

Answer

B

Explanation

When HCl is passed through the mixture `Cl^(-)` ion concentration increases. Hence ionic product.
`[Na^(+)][Cl^(-)]` becomes more than solubility product. So NaCl will precipitate out.
Filtrate `overset("HCl gas passed")to` pure NaCl precipitation (common ion effect).