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In an octahedral complex like $[Co(NH_3)_6]^{3+}$, the coordination number of cobalt is:
A$3$, the oxidation state of cobalt in this complex
B$4$, the standard tetrahedral coordination count
C$6$, since six NH$_3$ ligands bond to the cobalt centre
D$12$, since each NH$_3$ has three H atoms attached
Answer & Solution
Correct answer: C. $6$, since six NH$_3$ ligands bond to the cobalt centre
Six NH$_3$ ligands each donate one pair; CN = 6.
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