Diagram A shows a dry cell - HSC - SSCE Chemistry - Question 15 - 2004 - Paper 1

To determine the correctly labelled parts of the diagrams:

1. Analyze Diagram A (Dry Cell):

   • The anode is typically the negative terminal where oxidation occurs (zinc in common dry cells).
   • The cathode is the positive terminal where reduction happens (usually a carbon rod).

2. Analyze Diagram B (Lead-Acid Cell):

   • The anode is the lead plate, where oxidation occurs.
   • The cathode is the lead dioxide plate, where reduction occurs.
   • The negative terminal is connected to the anode, and the positive terminal is connected to the cathode.

3. Map the Labels to the Options:

   • From the analysis, the correct labelling corresponds to option (B) where:
     • 1 (Lead Dioxide): Cathode
     • 2 (Electrolyte): Anode
     • 3 (Lead Plate): Negative Terminal.