Give the systematic name of this coordination compound [co(nh3)5cl]cl2

                                        [Co (NH₃)₅ Cl] Cl₂

First identify the positive part and name it first:

Sphere is the positive part, we will name it first. In sphere ligands are name first in alphabetical order regardless of the prefix used. So, we are having 5 Ammines (common name for ammonia as it is neutral) and one Chlorido (those ligands which contain -ve charge ends with -o). So, ammine comes first and Chlorido second,

                                Pentaamminechlorido

As the charge on sphere is +ve so the name of Metal will remain unchanged (i.e. Cobalt) and the oxidation state of Co is +3 so it is written in barcket and in roman. i.e. 

                               Pentaamminechlorido cobalt (III)

At last name the negative part of complex, So,

                            Pentaamminechlorido cobalt (III) chloride

Yes it would be a physical change.