JAMB - Chemistry (2007 - No. 15)
What happens when zinc rod is immersed in copper (II) tetraoxosulphate (VI) solution?
The blue colour of the solution disappears
Electrons flow from copper to zinc
The zinc rod remain undissolved
The copper generate more copper ions
Explication
When a zinc rod is immersed in a copper (II) tetraoxosulphate (VI) solution (commonly known as copper sulphate solution), a chemical reaction occurs where the zinc displaces the copper ions in the solution, resulting in a reddish-brown coating of copper metal depositing on the zinc rod while the solution loses its blue colour as zinc sulphate is formed; this is a classic example of a displacement reaction.