Other / Mixed
A solid which is not transparent to visible light and whose conductivity increases with temperature is formed by
Show answer and solution
Answer: (b)
- Conductivity rising with temperature is the behaviour of a semiconductor such as Si or Ge.
- Si and Ge are opaque to visible light, and their atoms are held by covalent bonds.
- Metals lose conductivity when heated, and ionic or van der Waals solids are insulators.
- So the answer is (b) Covalent bonding.