WAEC - Chemistry (2000 - No. 24)
Which of the following will displace copper from a solution of copper (ll) salt?
Aluminium ions
Magnesium
Silver
Zinc ions
Wyjaśnienie
The tendency of a metal displacing the other is based on their position in the electrochemicals series. The metal above the other will displace the lower. Magnesium, Aluminium and Zinc are all above Copper, hence, by default, they should all displace Copper, but the option says Alumimium ion and Zinc ion, not Aluminium metal and Zinc metal. It is only Magnesium that is in metallic form not ion.Therefore, the answer is Magnesium. Option B
You can make reference to your electrochemical series.