The metal of the object may dissolve into the solution.
Explanation
Electroplating is an application of electrolysis used to coat a conductive object with a thin layer of metal. The process relies on the movement of ions in an electrolyte solution when an electric current is passed through it. The electrode connected to the positive terminal is the anode, and the electrode connected to the negative terminal is the cathode.
Mechanism Analysis:
- Standard Setup: In a correct electroplating circuit, the object to be plated is connected to the negative terminal (cathode). Positive metal ions from the solution gain electrons at the cathode (reduction) and deposit onto the object. The source metal is connected to the positive terminal (anode), where metal atoms lose electrons (oxidation) and dissolve into the solution to replenish the ions.
- Reversed Connection (Scenario in Question): If the object is connected to the positive terminal, it functions as the anode.
- At the anode, oxidation occurs. The metal atoms of the object lose electrons and enter the electrolyte solution as positive ions ($M \rightarrow M^+ + e^-$).
- Consequently, instead of receiving a coating, the material of the object begins to dissolve or strip away into the solution.
Option Analysis:
- The plating process will occur at double the speed.: Incorrect. The plating process will not speed up; it will reverse (stripping).
- The metal of the object may dissolve into the solution.: Correct. As the object acts as the anode, its metal atoms oxidize and dissolve into the electrolyte.
- The electrolyte solution will solidify.: Incorrect. The state of the electrolyte does not change to solid; electrolysis continues in the liquid phase.
- The battery will suffer immediate damage.: Incorrect. The battery will continue to drive the current as long as the circuit is complete; it does not suffer immediate damage solely due to the reversal of electrodes.
Key Takeaway:
In an electrolytic cell, oxidation (dissolution of metal) always occurs at the anode (positive terminal), while reduction (deposition of metal) occurs at the cathode (negative terminal).