REVIEW EXERCISES

Which of the following point defects are shown by $\mathrm{AgBr}\left(\mathrm{s}\right)$ crystals?
$\left(\mathrm{A}\right)$ Schottky defect.
$\left(\mathrm{B}\right)$ Frenkel defect.
$\left(\mathrm{C}\right)$ Metal excess defect.
$\left(\mathrm{D}\right)$ Metal deficiency defect.

In which pair most efficient packing is present?

The percentage of empty space in a body-centred cubic arrangement is:

Which of the following statements is not true about the hexagonal close packing?

In which of the following structures coordination number for cations and anions in the packed structure will be same?

What is the coordination number in a square close packed structure in two dimensions?

Which kind of defects are introduced by doping?

Silicon doped with electron-rich impurity forms: