In NaCl crystal each Cl– ion is surrounded by
Frenkel and Schottky defects are:
Certain crystals produce electric signals on application of pressure. This phenomenon is called:
Most crystals show good cleavage because their atoms, ions or molecules are
A solid with high electrical and thermal conductivity is
The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behaviour is a characteristic of substance forming
The element which is used as semiconductor is
An example of a covalent crystalline solid is:
Which of the following compounds is a good conductor of electricity in solution state?
