Question

in which of the following crystals all tetrahedral voids are occupied :
1• NaCl
2•Caf²
3•ZnS
4• Diamond ​

Answer 1

zns

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Answer 2

Answer:  $ZnS\ has\ Zn^{+2} ions\ in\ all\ tetrahedral\ voids$.3)ZnS has all tetrahedral voids occupied.

Explanation:

$NaCl=Na^{+} in\ fcc\ and\ Cl^{-}\ in\ octahedral\ voids(edge\ centre\ and\ body\ centre)\\CaF_{2}=Ca^{+2} in\ ccp\ arrangement\ and\ F^{^{-}} in\ all\ the\ tetrahedral\ voids\\ZnS=S^{-2} in\ lattice\ points\ and\ Zn^{+2} in\ alternate\ tetrahedral\ voids\\Diamond= carbon\ atoms\ in\ fcc$