Frenkel defect is also known as .............

Why does white $ZnO_{(s)}$ become yellow upon heating?

Which of the following compounds exhibits metal deficiency defect?

In the laboratory,sodium chloride is made by burning sodium in an atmosphere of chlorine. The resulting crystal is yellow in color. The cause of this yellow color is:

$NaCl$ is heated in an atmosphere of sodium vapour. The resultant yellow colour is due to the formation of

Identify the correct statement about the crystal defects in solids.