The conductivity of a solution of complex with formula CoCl₃(NH₃)₄ corresponds to 1:1 electrolyte, then the primary valency of central metal ion is

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Strategy:
 Determine the chemical structure from conductivity data, then identify the primary valency (oxidation state) which remains invariant.

Step 1: Interpret the conductivity
A 1:1 electrolyte means there are two ions produced per formula unit.
The formula given is . To produce two total ions, the complex must be composed of one complex cation and one free anion: .

Step 2: Find the primary valency
The primary valency is merely the oxidation state of the central cobalt atom.
.
The primary

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