Please solve this

Dear student
1) CdCl₂ + H₂S -------> CdS (Yellow) + 2HCl
2) ZnCl₂ + H₂S -------> ZnS (white) + 2HCl
3) CoCl₂ + H₂S -------> CoS (black) + 2HCl
4) CuCl₂ + H₂S -------> CuS (Black) + 2HCl
They all forms sulfides.
Regards