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Question

In the complex [CoCl2(en)2]Br, the co-ordination number and oxidation state of cobalt are:

A
6 and +3
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B
3 and +3
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C
4 and +2
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D
6 and +1
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Solution

The correct option is A 6 and +3
en is a bidentate ligand and Cl is a monodentate ligand.
Hence, coordination number is 6
. Oxidation state of Co:
x – 2 = +1
x = + 3

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