The correct option is
D Both A and B
Explanation for the correct option
Option D: Both A and B
Luster
- The property of an element that makes it appear shiny by reflecting light from its surface is called luster.
- Usually, metals are lustrous and non-metals are not lustrous.
Lustrous non-metals
- Non-metals generally have a dull appearance.
- However, diamond and iodine are exceptions. These two non-metals are lustrous.
Explanation for the incorrect options:
Option A: Diamond
- Diamond is a lustrous non-metal.
- However, iodine is also a lustrous non-metal.
- Since both options A and B are correct. This option is incorrect.
Option B: Iodine
- Iodine is a lustrous non-metal.
- However, diamond is also a lustrous non-metal.
- Since both options A and B are correct. This option is incorrect.
Option C: Sulphur
- Sulphur is a non-lustrous non-metal.
- Hence this option is incorrect.
Hence option D, Both A and B is the correct option.