Q. Consider the following substances:

1. Copper
2. Aluminium
3. Diamond
4. Sulphur

How many of the above are good conductors of heat?
Answer: Only three
Notes: Copper and aluminium are excellent conductors of heat due to their metallic bonding. Diamond, though an electrical insulator, is an exceptional thermal conductor because of its strong covalent structure. Sulphur, in contrast, is a poor conductor. Therefore, only three out of the four—copper, aluminium, and diamond—are good conductors of heat.