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The sum of each oxidation number in the coordination compound should add up to the total charge of the complex, which in this case is -4. Each CN is a -1 and there's 6 of them, so those are a total of -6. To have a sum of -4, the charge of the cation must be +2.
You determine roman numeral by finding the oxidation number of the metal. You determine the charge on the ligand, and if the coordination compound is an ion, then you can find the oxidation number by determining what number will make all charges true.
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