Answer
(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 \[=\text{ }2\]
Work Step by Step
Coordination number: The number of molecules or ions directly bound to the metal atom in a complex compound is called coordination number.
