To electroplate an article with nickel requires an electrolyte which must be a solution containing ___________ ions.

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Solution

Electroplating involves the coating of a superior metal on the surface of an inferior metal.
The process that is used in electroplating is electrolysis.
So it needs cathode, anode, and electrolyte.
The electrolyte to be used must contain the ions of the metal that is to be electroplated.
The electrolyte used in Nickel plating is Nickel sulfate( $N i S O_{4}$ ) and it contains Nickel( $N i^{2 +}$ ) ions.
To electroplate an article with nickel requires an electrolyte which must be a solution containing Nickel( $N i^{2 +}$ ) ions.

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