Copper chloride (CuCl2) as a yellow-brown powder (in anhydrous form) or a green crystalline solid (in dihydrate form) due to copper exist as divalent Cu2+ ions with 3d9 electronic configuration. Due to presence of 1 unpaired electron in 3d-orbital, it is coloured. Remaining ZnSO4,MgCl2 and AgCl are not coloured compounds respectively. Hence, only CuCl2 is expected to be coloured.