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The diagrams show a dry cell and a lead-acid cell - HSC - SSCE Chemistry - Question 12 - 2017 - Paper 1
Question 12
The diagrams show a dry cell and a lead-acid cell. The electrodes are labelled X and Y. Dry Cell: - Metal cap on carbon rod - Insulating layer - NH₄Cl paste - MnO₂... show full transcript
Worked Solution & Example Answer:The diagrams show a dry cell and a lead-acid cell - HSC - SSCE Chemistry - Question 12 - 2017 - Paper 1
Step 1
Electrode X: Negative, Electrode Y: Positive
Answer
In a dry cell, the zinc casing serves as the anode (negative electrode) where oxidation occurs. In a lead-acid cell, during discharge, the lead (Pb) is the anode (negative), and lead dioxide (PbO₂) serves as the cathode (positive). Thus, when either cell is connected to supply energy, Electrode X is negative (anode) and Electrode Y is positive (cathode). The correct option according to the marking scheme is D.