Question

Arrange the following processes in the correct order as they occur in an electrochemical cell with a copper anode and a silver cathode. A. Migration of cations and anions in the solution
B. Transfer of electrons at the electrode surfaces
C. Conduction of electrons in the external metal conductor
D. Oxidation and reduction reactions at the electrodes
Choose the correct answer from the options given below :

• A. A, B, C, D
• B. B, C, D, A
• C. C, A, B, D
• D. D, B, A, C

Hint:

Electrochemical cell: Redox → electron transfer → ion movement → current flow.

Answer 1

The Correct Option is D

Concept: An electrochemical cell involves redox reactions, electron flow, and ion movement to maintain electrical neutrality.

Step 1: Oxidation and reduction (D).
At the electrodes:
• Copper anode undergoes oxidation (Cu → Cu\textsuperscript{2+} + 2e\textsuperscript{-})
• Silver cathode undergoes reduction Thus, process starts with redox reactions.

Step 2: Electron transfer at electrodes (B).
Electrons are released and accepted at electrode surfaces.

Step 3: Ion migration (A).
To maintain charge balance:
• Cations move towards cathode
• Anions move towards anode

Step 4: Electron conduction (C).
Electrons flow through the external circuit from anode to cathode.

Step 5: Final sequence.
\[ D \rightarrow B \rightarrow A \rightarrow C \] Final Conclusion:
Hence, the correct answer is option (4).