Write IUPAC name ofthe conplex [Cr(H2O)5Cl]Cl2
There are five water ligands which will be named "aqua". There is one chloride ligand which will be named "chlorido". The oxidation state of the central metal atom is +3.
There is a chlorine molecule outside the coordination sphere (square bracket) and they will be named "chloride"
So the IUPAC name of the complex is Pentaquachloridochromium(III) chloride.