Out of KCl and  AgCl, which one shows Schottky defect and why?

OR

Why does ZnO apear yellow on heating? 

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

1(a) KCl shows schottky defect because size of cation \left [ K \right ]^+ and anion \left [Cl\right ]^- are similar in size. 

OR

1(b) On heating ZnO, it loses oxygen and turns yellow. The excess of Zn^{2+} ions thus formed get trapped into the vacant interstitial sites and the electrons in the neighbouring interstitial sites. 

ZnO\rightarrow Zn^{2+}+\frac{1}{2}O_2+2e^-.

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