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Question

Why ZnO is yellow at high temperature?


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Solution

Zinc oxide

  • ZnO is generally white in color.
  • When ZnO is heated above 800°C , it loses some of the Oxygen (O2) reversibly. This results in the yellow color of ZnO as it absorbs the blue wavelength of light, thus reflecting a yellow colour.
  • However, ZnO changes from yellow to white colour after cooling down.

Chemical Reaction

The above reaction is shown below:

ZnO(s)Zn2+(s)+12O2(g)+2e-

(Zinc oxide)


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