CrCl3.xNH3 can exist as a complex. 0.1 molal aqueous solution of this complex shows a depression in freezing point of 0.558ºC. Assuming 100% ionisation of this complex and coordination number of Cr is 6, the complex will be
(Given Kf = 1.86 K kg mol–1)
1
[Cr(NH3)6]Cl3
2
[Cr(NH3)4Cl2]Cl
3
[Cr(NH3)5Cl]Cl2
4
[Cr(NH3)3Cl3]