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Solution


Q.

The primary and secondary valencies of cobalt respectively in [Co(NH3)5Cl]Cl2 are:                        [2023]
1 3 and 5  
2 2 and 6  
3 2 and 8  
4 3 and 6  

Ans.

(4)

Primary valency = Oxidation number of central metal.

Secondary valency = Co-ordination number of central metal.

In [Co(NH3)5Cl]Cl2       Primary valency = 3

Secondary valency = 6