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  4. In the complex [ Co ( en )2 Cl 2] Br, the co-ordination number and oxidation state of cobalt are

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Q. In the complex $\left[ Co ( en )_{2} Cl _{2}\right] Br$, the co-ordination number and oxidation state of cobalt are

JIPMERJIPMER 2003

Solution:

Ethylene diamine (en) is a bidentate ligand, i.e., it has two donor centres. In the complex $\left[ CO ( en )_{2} Cl _{2}\right] Br$, the total number of donor atoms is $6 (4 $ from two 'en' moles $+2 Cl ^{-}$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 $
$x =+3$