Match the items in Column I with the items in Column II and assign the correct code.
| Column I | Column II |
| A. Pendulum | 1. Chrome steel |
| B. Malachite | 2. Nickel Steel |
| C. Calamine | 3. Na3AlF6 |
| D. Cryolite | 4. CuCO3. Cu (OH)2 |
| 5. ZnCO3 |
Codes
| A | B | C | D | |
| 1. | 1 | 2 | 3 | 4 |
| 2. | 2 | 4 | 5 | 3 |
| 3. | 2 | 3 | 4 | 5 |
| 4. | 4 | 5 | 3 | 2 |
