Question

. Account for the following: i) Frenkel defects are not found in alkali metal halides iii) Zinc oxide on heating becomes yellow.​

Answer 1

Answer:

i) Frenkel defect is not found in pure alkali metal halides. This is because of the larger size of the cations of the alkali metals, due to the large size the cations cannot fit into the interstitial sites.

ii) The hot zinc oxide absorbs blue wavelength of light and thus, the reflected light is observed as yellow. On heating, zinc oxide also loses a minute amount of oxygen. When oxygen is lost from the crystal lattice and Frenkel defect is created. The zinc ion formed then enters the voids formed due to heating.

Explanation:

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