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Barium ion , CN^(-) and Co^(2+) form an ...

Barium ion , `CN^(-)` and `Co^(2+)` form an ionic complex . If that complex is supposed to be `75%` ionised in water with van't Hoff factor `'i'` equal to four , then the coordination number of `Co^(2+)` in the complex can be :

A

6

B

4

C

6 & 4 both possible

D

5

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