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प्रश्न
Agl crystallises in cubic close-packed ZnS structure. What fraction of tetrahedral sites are occupied by Ag+ ions?
संख्यात्मक
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उत्तर
In the ZnS (zinc blende) structure, the anions (I−) form a cubic close-packed (ccp) lattice, and the cations (Ag+) occupy the tetrahedral voids.
In a ccp arrangement the number of tetrahedral voids is twice the number of anions present.
If the number of I− ions is n, then the number of tetrahedral voids is 2n and Number of Ag+ ions is n.
Fraction of tetrahedral voids occupied:
= `n/(2n)`
= `1/2`
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