Question

Which substances do not conduct electricity in solid but conduct in molten state give the reason for the answer

Answer 1

Molecular solids, such as sugar or sulfur, do not conduct electricity in their solid state but do conduct in their molten state.

This is because in their solid state, the molecules are held together by strong covalent bonds and are unable to move freely to carry an electric current. However, when these substances are melted, the covalent bonds are broken, allowing the molecules to move freely and thus conduct electricity.