56. Solving a chemistry problem

16. It is known that chromium (III) chloride hexahydrate exists in different forms depending on the synthesis conditions. One of them forms aqueous solutions of dark green color, the second - bluish-green, the third - violet. From a dark green solution, using an aqueous solution of silver nitrate, only 1/3 of the total chlorine contained in the original compound can be precipitated in the form of silver chloride ions. From the bluish-green solution, 2/3 of the chlorine precipitates, and from the violet solution, all the chlorine passes into silver chloride. What is the reason for this behavior of different forms of chromium (III) chloride hexahydrate?