A) 6 and + 1
B) 6 and + 3
C) 3 and + 3
D) 4 and + 2
Correct Answer: B
Solution :
Ethylene diamine (en.) is a bidentate ligand, i.e., it has two donor centres. In the complex \[[CO{{(en)}_{2}}C{{l}_{2}}]Br,\]the total number of donor atoms is 6(4 from two en moles +2\[C{{l}^{-}}\] ions). Let the oxidation state of Co be x. \[x+(0\times 2)+(-1\times 2)+(-1)=0\] \[x+0-2-1=0\] \[x-3=0\] \[x=+\,3\]
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