Galvanic Cells

Step 1: Daniell Cell Overview.
A Daniell cell is an electrochemical cell that consists of a zinc electrode in a zinc sulfate solution and a copper electrode in a copper sulfate solution. The overall reaction in a Daniell cell is: In this reaction, zinc undergoes oxidation at the anode (losing electrons) and copper ions undergo reduction at the cathode (gaining electrons).

Step 2: Analysis of options.
- (1) : This is incorrect as the zinc is solid, not in the aqueous form.
- (2) : This is incorrect as it does not represent a Daniell cell and involves incorrect states of matter.
- (3) : This is correct and represents the actual Daniell cell reaction.
- (4) : This is incorrect and does not represent a Daniell cell.

Step 3: Conclusion.
Thus, the correct reaction for a Daniell cell is option (3):