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Assertion: $\mathrm{ZnO}$ becomes yellow when it is heated.
Reason : Metal excess defect arises due to excess of $\mathrm{Zn}^{2+}$ ions which move to interstitial sites and the electron moves to neighbouring interstitial sites.
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Reason : Metal excess defect arises due to excess of $\mathrm{Zn}^{2+}$ ions which move to interstitial sites and the electron moves to neighbouring interstitial sites.
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If both assertion and reason are true and reason is the correct explanation of assertion.
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