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For the purpose of depositing silver on iron spoon electroplating must be used. Since the material to be electroplated is iron spoon, it should be connected to the negative terminal of the battery.

Since silver is to be deposited the electrode connected to the positive terminal should be made of silver.

Silver nitrate is used as solution. When electric current is passed silver nitrate breaks into silver and nitrate ions and the silver ions get attracted to the negative plate and gets deposited on the iron rod.