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Q.

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

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a

Na₂O

b

ZnS

c

CaF₂

d

NaCl

answer is B.

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Detailed Solution

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In ZnS crystal, $S^{2 -}$ will occupy all lattice points, and ${Zn}^{2 +}$ will occupy all the alternative tetrahedral voids.
In one body diagonal two tetrahedral voids are present. And in a cubic structure, there are four body diagonal so the total number of tetrahedral voids is eight.

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