alleryThe primary and secondary valences of Co in [Co(NH₃)₆]Cl₃ are respectively
A3 and 3
B3 and 6
C6 and 3
D6 and 6
Answer & Solution
Correct answer: B. 3 and 6
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: syllabus Chemistry, Unit 5 "Coordination Compounds", §5.1_
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