Zinc oxide loses oxygen on heating according to the reaction, heat ZnO Zn O 2e → It becomes yellow on heating because

This phenomenon occurs in metal excess defect The electrons moves into the interstitial site & F⁻ centers are created which causes yellow colour on heating. 123. What is the effect of Frenkel defect on the density of ionic solids? (a) The density of the crystal increases. (b) The density of the crystal decreases. (c) The density of the crystal remains unchanged. (d) There is no relationship between density of a crystal and defect present in it. Density remains unchanged. This is because the number of cations and anions doesn’t change, just the position of cations gets changed. Thus, the den