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Question

ZnO is white when cold and yellow when heated. It is due to development of:

A
Frenkel defect
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B
metal excess defect
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C
Schottky defect
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D
metal deficiency defect
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Solution

The correct option is B metal excess defect
ZnO turns yellow on heating as Zn2+ ions move in interstitial sites and electrons also get entrapped in nearby interstitial sites to maintain electrical neutrality. As extra Zn2+ ions are present in interstitial sites thus, it is metal excess defect.

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