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Question: Answered & Verified by Expert
Why does white ZnO (s) becomes yellow upon heating?
ChemistrySolid StateNEET
Options:
  • A Because heating causes the decomposition of ZnO.
  • B Because white ZnO is impure and contains yellow impurities.
  • C Because F-centres are created when Zn2+ions (generated when ZnO is heated) and electrons move to interstitial sites
  • D Because ZnO naturally changes colour when exposed to heat.
Solution:
2499 Upvotes Verified Answer
The correct answer is: Because F-centres are created when Zn2+ions (generated when ZnO is heated) and electrons move to interstitial sites
Correct Option is : (C)
Because F-centres are created when Zn2+ions (generated when ZnO is heated) and electrons move to interstitial sites

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