When 1 mole of CrCl3.6H2O is treated with excess of AgNO3, 3 moles of AgCl are obtained. The formula of the complex is:

1. [CrCl3(H2O)3].3H2O
2. [CrCl2(H2O)4]Cl.2H2O
3. [CrCl3(H2O)5]Cl2.H2O
4. [Cr(H2O)6]Cl3