Question

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

पर्याय

• +1

• +3

• −1

• −3

Answer 1

The oxidation number of cobalt in K[Co(CO)₄] is −1.

We know that CO is a neutral ligand and K carries a charge of +1.

+1 + x + 4(0) = 0

+1 + x + 0 = 0

x = −1 

Therefore, the oxidation number of Co in the given complex is −1.