The secondary valency of Co in $[Co(en)_{3}]_{2}(SO_{4})_{3}$ is:
Show Hint
- 12
- 2
- 3
- 6
The Correct Option is D
Solution and Explanation
In Werner's coordination theory, primary valency corresponds to the oxidation state, while secondary valency corresponds to the coordination number of the central metal ion.
Step 2: Meaning
The coordination number is the total number of coordinate covalent bonds the ligands form with the central metal atom.
Step 3: Analysis
In the complex ion $[Co(en)_{3}]^{3+}$, the ligand "en" represents ethylenediamine. Ethylenediamine is a bidentate ligand, meaning a single molecule donates two pairs of electrons to form two coordinate bonds. There are 3 "en" molecules.
Step 4: Conclusion
The total number of coordinate bonds is $3 \text{ ligands} \times 2 \text{ bonds/ligand} = 6$. Therefore, the secondary valency is 6.
Final Answer: (D)
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