Match the items of Column I and Column II.
| Column I | Column II | ||
| A | Lead storage battery | 1. | Maximum efficiency |
| B | Mercury cell | 2. | Prevented by galvanization |
| C | Fuel cell | 3. | Gives steady potential |
| D | Rusting | 4. | Pb is an anode, PbO2 is cathode |
Codes:
| Options: | A | B | C | D |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 1 | 2 | 3 | 5 |
| 3. | 5 | 4 | 3 | 2 |
| 4. | 4 | 3 | 1 | 2 |
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