The yellow colour of ZnO and conducting nature produced on heating is due to :

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The yellow colour of ZnO and conducting nature produced on heating is due to :

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trapped electrons

trapped anions

extra positive ions present in an interstitial site

interstitial cation present in metal excess defect

answer is C.

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Detailed Solution

On heating ZnO, it loses oxygen

$ZnO \overset{Δ}{⟶} 2 n^{2 t} + \frac{1}{2} O_{2} + 2 e^{-}$

Excess ${Zn}^{2 +}$ ions moves to interstitial sites thus trapping electrons and showing yellow colour.

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