Q.

Statement - I : Zinc oxide is yellow colored when hot.
Statement - II : Zinc oxide has metal excess defect due to anionic vacancies.

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a

Both statements I and II are correct

b

Statement-I is correct and statement-II is incorrect

c

Statement-I is incorrect and statement-II is correct

d

Both statements I and II are incorrect

answer is B.

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Detailed Solution

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  • Zinc oxide is white in color at room temperature. 
  • On heating it loses oxygen and turns yellow.
  • Question Image
  • Now there is excess of zinc in the crystal and its formula becomes Zn1+xO. 
  • The excess Zn2+ ions move to interstitial sites and the electrons to neighboring interstitial sites.
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Statement - I : Zinc oxide is yellow colored when hot.Statement - II : Zinc oxide has metal excess defect due to anionic vacancies.