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Question

The EAN of cobalt is the complex ion [Co(en)2Cl2]+ is :

A
27
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B
36
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C
33
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D
35
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Solution

The correct option is A 36
Atomic number of cobalt is 27, Hence the ground electronic configuration is 3d74s2 and that of Co(III) is 3d64s0.

Hence EAN = 27-3+(4x2)+(2x2) = 36 (4 of ethylenediamine as it is a bidentate ligand and 2 for each Cl).

Therefore the correct option is B.

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