The primary and secondary valences of Co in [Co(NH₃)₆]Cl₃ are respecti…

Question

The primary and secondary valences of Co in [Co(NH₃)₆]Cl₃ are respectively

Accepted Answer

B. {'text': '3 and 6', 'label': 'B'}

1. Werner defined primary valence as the ionisable (oxidation-state-related) valence.
2. Co in this complex is +3, so primary valence = 3.
3. Secondary valence equals the coordination number, i.e. bonds to donor atoms.
4. Six NH₃ ligands bond directly, giving secondary valence = 6.
_Source: NCERT Class 12 Chemistry, Unit 5 "Coordination Compounds", §5.1_

Answer

{'text': '3 and 3', 'label': 'A'}

Answer

{'text': '6 and 3', 'label': 'C'}

Answer

{'text': '6 and 6', 'label': 'D'}