Which type of solid crystals will conduct heat and electricity?

$NaCl$ and $C_6H_6$ exhibit which type of magnetism?

Classify the following materials into superconductors,conductors,semiconductors,and insulators: $Cu$,$Al$,$Si$,$Ge$,glass,Teflon,$Au$,$Pt$,$CuO$ (at low temperature),graphite,carbon black,and alloys at low temperature.

The existence of a substance in more than one solid modification is known as

The sharp melting point of crystalline solids is due to

Which of the following metals expands on solidification?