Unlabeled flasks contain solutions of sodium chloride, potassium dichromate

Unlabeled flasks contain solutions of sodium chloride, potassium dichromate, ferric chloride (3), and copper chloride (2). How to determine them?

In order to determine which of the bottles without labels contains solutions of sodium chloride, potassium dichromate, ferric chloride and copper chloride, you need to know that the listed solutions differ in their color.
1.) First, consider a sodium chloride solution, in connection with which we recall that sodium chloride is the sodium salt of hydrochloric acid, which
in everyday life, we all know as common table salt. The main component of salt is sodium chloride. Accordingly, its solution is colorless.
2.) Now consider potassium dichromate, which is orange crystals. Thus, the potassium dichromate solution is also orange in color.
3.) Now consider ferric chloride. First, you need to know which ferric chloride is meant: FeCl2 or FeCl3.
The solution of the first, that is, FeCl2, is green, and the second, FeCl3, is brownish brown.
4.) Next, consider copper chloride: its concentrated solution is green, and diluted is blue.