Question

In the complex ion $\left[ Co \left( NH _{3}\right)_{6}\right]^{3+}$, the $NH _{3}$ molecules are linked to the central metal ion by

• A. ionic bonds
• B. covalent bonds
• C. coordinate bonds
• D. hydrogen bonds

Answer 1

Answer: (C)

coordinate bonds

Answer 2

A complex is formed, when ligand(s) donates its (their) electrons to the vacant $d$-orbital of transition metals. Since, the electrons are given by only ligands and used up by metals as well as ligands, the bond formed is called coordinate bond.