Question
$\ce{IUPAC}$ name for the complex $\ce{[Cu(NH_3​)_4​]SO_4}$​ is$:$

Answer

Since $4$ amino groups are present, it will be called as tetrammine.
Since copper$(II)$ is the central metal, it will be tetrammine copper$(II).$
Note that we can determine the oxidation number of copper by charge balance.
Now finally since sulphate is the counter ion, it's full name will be tetrammine copper$(II)$ sulphate.

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