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A Complex compound Co^{3+} with molecular formula CoCl_{x}.yNH_{3} gives a total of 3 ions when dissolved in water.How many Cl^{-} ions satisfy both primary and secondary valencies in this complex?

You have not mentioned the total number of Cl atoms or number of NH

_{3}ligands in complex. In such a case it is difficult to find out the number of Cl and NH

_{3}in the complex that is bound as secondary valency.

If you mean the number of Cl- satisfying the primary as well as secondary valency is same then it can be solved like this :

Since the complex is giving total 3 ions it means it carry 2 of the chloride as the primary valency. Then 2 of the chlorine will also bound as secondary valency. The molecular formula of complex can be written as :

[Co(NH

_{3})

_{4}Cl

_{2}]Cl

_{2}

Here Co is also considered having coordination number of 6.

So,2 Cl

^{-}ions satisfy both primary and secondary valencies in this complex.

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