$\text{CrC}{{\text{l}}_{3}}\cdot \text{xN}{{\text{H}}_{3}}$ can exist as a complex. 0.1 molal aqueous solution of this complex shows a depression in freezing point of ${{0.558}^{{}^\circ }}\text{C}$ . Assuming 100% ionisation of this complex and coordination number of Cr is 6, the complex will be (Given ${{\text{K}}_{\text{f}}}=1.86~\text{K}~\text{kg}~\text{mo}{{\text{l}}^{{-1}}}$)