question

out of  and  , which one shows schottky defect and why?

or

why does apear yellow on heating? 

 

 

 

 

 

 

 

 

1(a)shows schottky defect because size of cationand anionare similar in size.

or

1(b) on heating, it loses oxygen and turns yellow. the excess ofions thus formed get trapped into the vacant interstitial sites and the electrons in the neighbouring interstitial sites.