\( \mathrm{ZnO} \) is white when cold and yellow when heated, it is due to the development of (A...

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\( \mathrm{ZnO} \) is white when cold and yellow when heated, it is due to the development of
(A) Frenkel defect
(B) Schottky defect
(C) Metal excess defect
(D) Metal deficiency defect
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