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What is the co-ordination number of an octahedral void?


The co-ordination number of an octahedral void  is  6 : 6.
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what is Frenkel defect.Why is Frenkel defect found in AgCl ?

Frenkel Defect: This defect is shown by ionic solids. The smaller ion (usually cation) is dislocated from its normal site to an interstitial site . It creates a vacancy defect at its original site and an interstitial defect at its new location.
 Frenkel defect is shown by ionic substance in which there is a large difference in the size of ions so it is due to difference in size of Ag
+ and CI, Ag+ occupies voids.
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Give two exampls of the compounds that exhibit Schottky defect.

KCl, AgBr
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What  type of void are developed in hexagonal close packing?

In hexagonal close packing octahedral void as well as tetrahedral void are produced.
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What are interstitials in a crystal?

The atoms or ions which occupy the voids present in a crystal are termed interstitials.
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