SELECT * FROM question_mgmt as q WHERE id=1956 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=64 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

The oxidation number of cobalt in K[Co(CO)4] is

(i) +1

(ii) +3

(iii) -1

(iv) -3

Answer:

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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