Discussion
Match the materials in Column I with the applications in Column II
| Column I | Column II |
|---|---|
| P. Titanium diboride | 1. Photocatalyst |
| Q. Molybdenum disilicide | 2. Furnace heating element |
| R. Hydroxyapatite | 3. Ultra high temperature material |
| S. Nanocrystalline titanium oxide | 4. Tough ceramic |
| 5. Artificial bone implant |
Answer: D
The match is P-3, Q-2, R-5, S-1.
- Titanium diboride melts above 3200°C and is classed among the ultra-high temperature ceramics.
- Molybdenum disilicide forms a protective silica layer when hot and is the standard element for furnaces running up to about 1800°C.
- Hydroxyapatite, Ca10(PO4)6(OH)2, is the mineral of bone and is used for bone implants and coatings.
- Nanocrystalline titanium dioxide (anatase) is the classic photocatalyst.
'Tough ceramic' fits none of these four (it suits materials such as zirconia), which is why it is the extra item. Options putting MoSi2 as a tough ceramic or TiB2 as an implant are wrong.
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