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In a crystal some iron are missing fro...

In a crystal some iron are missing from normal sites. This is an example of

A

F-centres

B

Interstitial defect

C

Frenkel defect

D

Schottky defect

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Verified by Experts

The correct Answer is:
d
Schottky defects are arised when one position ion and one negative ion are missing from their respectively position common in ionic compounds with high co-ordination number and havind almost similar size of cations and anions.
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In a crystal, some ions are missing from normal sites. This is an example of :

Any deviation from the perfectly ordered arrangement constitutes a defect or imperfection. The compounds in which the number of irregularity are present in the arrangement of atoms or ions are called atomic imperfections or point defects. These may be stochiometric or non - stoichlometric. Stoichiometric defects are further classified into Schottky defects in which number of positive and negative ions are missing in equal ratio and Frenkel defects in which an ion leaves its correct lattice sites and occupies on interstitial site. Schottky defect is more common in ionic compounds with high co-ordination number and where the size of positive and negative ions are almost equal, while in Frenkel defects are common in ionic compounds, which have low co-ordination number and in which there is large difference in size between positive and negative ions. In a crystal some ions are missing from normal sites. This is an example of

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Assertion: In frekel defect in an ionic crystal, an ion is dispalced from its normal site to an interstitial site. Reason: There is both a vacancy and an intersitial ion.

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