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Q.

In which of the following crystals, alternate tetrahedral voids are occupied?

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a

NaCl

b

ZnS

c

CaF2

d

Na2O

answer is B.

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Detailed Solution

In ZnS structure, sulphide ions occupy all FCC lattice points while Zn2+ ions are present in alternate tetrahedral voids. In zinc blend structure S-2 ions follows ccp/fcc  arrangement, that means S-2 ions are present at corners and face  centres .And half of alternate tetrahedral voids are occupied by Zn2+ions.
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In which of the following crystals, alternate tetrahedral voids are occupied?