Question

The coordination number of Pt and Fe in the complexes [PtCl\(_6\)]\(^{2-}\) and [Fe(C\(_2\)O\(_4\))\(_3\)]\(^{3-}\) are respectively

• A. 4 and 6
• B. 6 and 6
• C. 4 and 4
• D. 6 and 8
• E. 4 and 8

Hint:

The coordination number of a metal in a complex is determined by the number of ligand atoms directly bonded to the metal ion.

Answer 1

The Correct Option is B

In the complex [PtCl\(_6\)]\(^{2-}\), platinum (Pt) is coordinated to 6 chloride ions, so the coordination number of Pt is 6. In the complex [Fe(C\(_2\)O\(_4\))\(_3\)]\(^{3-}\), iron (Fe) is coordinated to 6 oxalate ions, so the coordination number of Fe is also 6. 
Thus, the correct answer is (B).