MCQ
The oxidation number of cobalt in K[Co(CO)4] is:
- A+1
- B+3
- C–1
- D–3
✓
Answer
- –1
We know that CO is a neutral ligand and K carries a charge of +1. Therefore, the complex can be written as K+[Co(CO)4]- . Therefore, the oxidation number − of Co in the given complex is -1. Hence, option (iii) is correct.
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