Why ZnO is yellow at high temperature?

When zinc oxide is heated strongly above 800-degree celcius, it turns yellow. After cooling down, the colour of zinc oxide changes back to white. Thus, it is a reversible process. The hot zinc oxide absorbs the blue wavelength of light, and thus, the reflected light is observed as yellow.

  • In ZnO, the ions of Zn2+ occupy the interstitial sites and electrons are trapped in the interstitial sites because of neutralization.
  • The colour of zinc oxide is white at room temperature, whereas on heating, it turns yellow due to loss of oxygen reversibly at .very high temperatures

Was this answer helpful?


5 (1)


Choose An Option That Best Describes Your Problem

Thank you. Your Feedback will Help us Serve you better.

Leave a Comment

Your Mobile number and Email id will not be published. Required fields are marked *




Free Class