Question:
The primary and secondary valencies of cobalt respectively in \([ Co(NH_3)_5Cl]Cl_2\) are :
The primary and secondary valencies of cobalt respectively in \([ Co(NH_3)_5Cl]Cl_2\) are :
Updated On: Nov 2, 2025
- 3 and 5
- 2 and 6
- 2 and 8
- 3 and 6
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The Correct Option is D
Solution and Explanation
The complex compound \([ \text{Co(NH}_3)_5\text{Cl}] \text{Cl}_2\) has cobalt (\( \text{Co} \)) with an oxidation number of \( +3 \).
Primary valency: The primary valency corresponds to the oxidation state of cobalt, which is \( +3 \).
Secondary valency: The secondary valency corresponds to the coordination number, which is the total number of ligands directly bonded to the metal ion. In this case, there are 5 ammonia (\( \text{NH}_3 \)) molecules and 1 chloride ion (\( \text{Cl}^- \)), giving a coordination number of 6.
Conclusion: The primary valency is 3, and the secondary valency is 6.
Primary valency: The primary valency corresponds to the oxidation state of cobalt, which is \( +3 \).
Secondary valency: The secondary valency corresponds to the coordination number, which is the total number of ligands directly bonded to the metal ion. In this case, there are 5 ammonia (\( \text{NH}_3 \)) molecules and 1 chloride ion (\( \text{Cl}^- \)), giving a coordination number of 6.
Conclusion: The primary valency is 3, and the secondary valency is 6.
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.