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If the crystallises in zinc blende struc...

If the crystallises in zinc blende structure with `I^-` ions at lattice points. What fraction of tetrahedral voids is occupied by `Ag^+` ions ?

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In AgI, if there are n `I^-` ions, there will be n `Ag^+` ions. As `I^-` ions from the lattice, number of tetrahedral voids=2n. As there are n `Ag^+` ions to occupy these voids, therefore, fraction of tetrahedral voids occupied by `Ag^+` ions =n/2n=1/2=50%
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