Why does white ZnO_{(s)} become yellow upon h | vedclass

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(D) On heating,$ZnO$ loses oxygen as follows:$ZnO_{(s)} \stackrel{\Delta}{\longrightarrow} Zn^{2+} + \frac{1}{2} O_{2} + 2e^{-}$The $Zn^{2+}$ ions for

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(D) On heating,$ZnO$ loses oxygen as follows:$ZnO_{(s)} \stackrel{\Delta}{\longrightarrow} Zn^{2+} + \frac{1}{2} O_{2} + 2e^{-}$The $Zn^{2+}$ ions formed occupy interstitial sites,and the electrons occupy neighboring interstitial sites to maintain electrical neutrality.These trapped electrons in the interstitial sites absorb energy from visible light and get excited,which imparts a yellow color to the $ZnO$ crystal.

Why does white $ZnO_{(s)}$ become yellow upon heating?

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