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Question 44

The primary and secondary valencies of cobalt respectively in Co(NH$$_3$$)$$_5$$ClCl$$_2$$ are:

Solution

In $$[Co(NH_3)_5Cl]Cl_2$$:

Primary valency (oxidation state of Co) = +3 (since total charge: 5(0) + (-1) + Co = +2 from 2Cl⁻, so Co = +3).

Secondary valency (coordination number) = 6 (5 NH₃ + 1 Cl⁻ in the coordination sphere).

Therefore, primary valency = 3 and secondary valency = 6.

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