Chemistry: Molecular Approach (4th Edition)

(a) ${{\left[ Cr{{\left( {{H}_{2}}O \right)}_{6}} \right]}^{3+}}$ Oxidation state of metal $=\text{ +3}$ Coordination number $=\text{ }6$ (b) ${{\left[ Co{{\left( N{{H}_{3}} \right)}_{3}}C{{l}_{3}} \right]}^{-}}$ Oxidation state of metal $=\text{ +2}$ Coordination number $=\text{ }6$ (c) ${{\left[ Cu{{\left( CN \right)}_{4}} \right]}^{2-}}$ Oxidation state of metal $=\text{ +2}$ Coordination number $=\text{ }4$ (d) ${{\left[ Ag{{\left( N{{H}_{3}} \right)}_{2}} \right]}^{+}}$ Oxidation state of metal $=\,+1$ Coordination number $=\text{ }2$