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