Schottky defect in a crystal is observed when,
- AUnequal number of cations and anions are missing from the lattice.
- BEqual number of cations and anions are missing from the lattice.
- CAn ion leaves its normal site and occupies an interstitial site.
- DNo ion is missing from its lattice site.
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When $ZnO$ is heated,it turns from white to yellow because it ................
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View SolutionCalcium crystallizes in a face-centred cubic $(FCC)$ lattice with an edge length of $556 \ pm$. Calculate the density if:
$(i)$ There is $0.1 \%$ Schottky defect.
$(ii)$ There is $0.1 \%$ Frenkel defect.
$(i)$ There is $0.1 \%$ Schottky defect.
$(ii)$ There is $0.1 \%$ Frenkel defect.
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View SolutionWhich statement is correct regarding the $F$-center?
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View SolutionWhich of the following solids does not exhibit Frenkel defect?
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View SolutionThe correct statement$(s)$ regarding defects in solids is(are):
$A$. Frenkel defect is usually favoured by a very small difference in the sizes of cation and anion.
$B$. Frenkel defect is a dislocation defect.
$C$. Trapping of an electron in the lattice leads to the formation of $F$-center.
$D$. Schottky defects have no effect on the physical properties of solids.
$A$. Frenkel defect is usually favoured by a very small difference in the sizes of cation and anion.
$B$. Frenkel defect is a dislocation defect.
$C$. Trapping of an electron in the lattice leads to the formation of $F$-center.
$D$. Schottky defects have no effect on the physical properties of solids.
DifficultIIT 2009
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