Question

The coordination number of cobalt in $[\text{Co(NH}_3)_6]^{3+}$ is}

• A. 6
• B. 4
• C. 3
• D. 2

Hint:

Remember that the coordination number is equal to the total number of coordinate bonds formed, not just the number of ligands. For example, bidentate ligands like oxalate ($\text{ox}$) or ethylenediamine ($\text{en}$) form two bonds per ligand! {0.4\textwidth} Coordination Geometry Summary {|c|c|} Coordination No. & Geometry
2 & Linear
4 & Tetrahedral Sq. Planar
6 & Octahedral

Answer 1

The Correct Option is A