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Solid State — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistrySolid State1 Mark
Question
ZnO becomes yellow on heating. Why?
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Answer

Due to Frenkal defect, ZnO loses its oxygen on heating and turns yellow in colour.
$ ZnO_{(s)} \xrightarrow{Heat} Zn^{2+} + \frac{1}{2}O_{2} + 2e^{-} $

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