Tamilnadu BoardEnglish MediumSTD 12ChemistryCoordination Chemistry2 Marks
Question
Differentiate primary valency and secondary valency.
✓
Answer
Primary Valency:
1. The primary valence of a metal ion positive in most of the cases and zero in certain cases.
2. The primary valence is always satisfied by negative ions.
3. The primary valences are non directional
4. Example: In $COCl _3 \cdot 6 NH _3$, the primary valence of cobalt is +3
Secondary Valency :
1. The secondary valence as the coordination number.
2. The secondary valence is satisfied by negative ions, neutral molecular or positive ions.
3. The secondary valences are directional
4. Example: In $COCl _3 .6 NH _3$, the secondary valence of cobalt is 6
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