1.

AgI crystallises in a cubic close-packed ZnS structure. What fraction of tetrahedral sites is occupied by `Ag^(+)` ions ?

Answer» In the face centred unit cell of AgI, there are four `Ag^(+)` ions and four `I^(-)` ions. As there are four `I^(-)` ions in the packing,therefore there are eight tetrahedral voids. Half of these are occupied by `Ag^(+)` ions.


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