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What type of stoichiometric defect is shown by
(i) ZnS, (ii) AgBr (iii) KCl


(i) Frenkel defect.
(ii) Schottky defect and Frenkel defect.
(iii) Schottky defect.

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Explain how vacancies are introduced in an ionic solid when a cation of higher valence is added as an impurity in it.

A group 14 element is to be converted into N-type semi-conductor by doping it with a suitable impurity. To which group should this impurity belong?

Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitale example.

What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic, justify your answer.


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