1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion: ZnO becomes yellow when it is heated. Reason: Metal excess defect arises due to excess of Zn2+ ions which move to interstitial sites and the electron moves to neighbouring interstitial sites.

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Q. Assertion : $ZnO$ becomes yellow when it is heated.
Reason : Metal excess defect arises due to excess of $Zn^{2+}$ ions which move to interstitial sites and the electron moves to neighbouring interstitial sites.

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Solution:

Correct answer is (a) If both assertion and reason are true and reason is the correct explanation of assertion