JAMB - Chemistry (1990 - No. 6)
Iron galvanized with zinc is cathodically protected from corrosion. This is because?
zinc has a more positive oxidation potential than iron
zinc has less positive oxidation potential than iron
bith have the same oxidation potential
zinc is harder than iron
解释
Iron galvanized with zinc is cathodically protected from corrosion because Zinc has a more positive oxidation potential than iron. This means that Zinc will preferentially corrode, acting as a sacrificial anode.