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(B) When $ZnO$ is heated,it loses oxygen and becomes non-stoichiometric: $ZnO \xrightarrow{\Delta} Zn^{2 }   \frac{1}{2} O_2   2e^-$. The excess $Zn^{

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loses oxygen

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(B) When $ZnO$ is heated,it loses oxygen and becomes non-stoichiometric: $ZnO \xrightarrow{\Delta} Zn^{2 }   \frac{1}{2} O_2   2e^-$. The excess $Zn^{2 }$ ions move to interstitial sites,and the electrons move to neighboring interstitial sites to maintain electrical neutrality. This creates an $F$-center-like defect,which absorbs light in the visible region,causing the substance to appear yellow.

When $ZnO$ is heated,it turns from white to yellow because it ................

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