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Question

White ZnO (s) becomes yellow upon heating due to
  1. Creation of F-centers
  2. Addition of electrons
  3. Creation of Frenkel defect
  4. All of the above


Solution

The correct option is A Creation of F-centers

On heating ZnO loses oxygen according to the following reaction.

ZnOZn2++(12)O2+2e

Zn2+ ions and electrons move to interstitial sites and F-centres are created which impart yellow colour to ZnO(s).

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