The primary and secondary valencies of cobalt respectively in are:

Question

The primary and secondary valencies of cobalt respectively in  are:

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Strategy:
 In Werner's theory, primary valency corresponds to the oxidation state of the metal, and secondary valency corresponds to its coordination number.

Step 1: Determine Primary Valency (Oxidation State)
The complex is . The complex ion is .
.
Primary Valency = 3.

Step 2: Determine Secondary Valency (Coordination Number)
The metal is bonded to 5  molecules and 1  ion.
Total bonds = .
Secondary Valency = 6.

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