Alloys are preferred over metals for making the heating element of heaters. Why ?

Why is Nichrome used as a heating element?

Why does the cord of an electric heater not glow while the heating element does?

Statement-I : Germanium is preferred over silicon for making semiconductor devices Statement-II : Energy gap for Ge is more than that of SI

Ethers should not be heated to dryness. Why ?

What are metalloids or semi-metallic elements ? Give examples.