Answer:
Solid Zn.
Step-by-step explanation:
- Anode is the electrode (metal) at which oxidation process is occurred (electrons produced).
- Cathode is the electrode (metal) at which reduction process is occurred (electrons consumed).
In the shown diagram:
- Zn is oxidized to Zn²⁺ and produces 2 electrons.
- Cu²⁺ is reduced to Cu and consumes 2 electrons.
So, the anode is solid Zn.