Schottky Defect

Q.

Which is the incorrect statement?

1. Density decreases in case of crystals with Schottky defect

2. $NaC{l}_{\left(s\right)}$ is an insulator, silicon is a semiconductor, silver is a conductor, quartz is a piezoelectric crystal.

3. Frenkel defect is favoured in those ionic compounds in which sizes of cations and anions are almost equal.

4. 
   $Fe{O}_{0.98}$ has non-stiochiometric metal deficiency defect.

Q. 45. CsCl has bcc arrangement. Its unit cell edge length in 400 pm. What will be its inter-ionic distance ?

Q.

Which of the following defects is generally found in sodium chloride and cesium chloride?

1. Frenkel defect

2. Interstitial defect

3. Schottky defect

4. none of these

Q. Write any four characteristics of ionic hydrid