Zno crystal on heating acquires the formula zn 1+x o. Give reason.
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Zinc oxide is white in colour at room temperature. On heating it loses oxygen and turns yellow.
ZnO —-> Zn2+ + ½ O2 +2e–
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 neighbouring interstitial sites.
ZnO —-> Zn2+ + ½ O2 +2e–
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 neighbouring interstitial sites.
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