Agl crystallises in cubic close packed ZnS structure. What fracti
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    The Solid State

    Multiple Choice QuestionsShort Answer Type

    91. Although pure silicon is an insulator, then how does it behave as a semiconductor on heating.
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    92. What is meant by tetrahedral void in a close-packed structure?
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    93. What is meant by octahedral void in a close-packed structure?
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    94. How many vertex, edges, faces and centres are there in a cubic unit cell?
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    95. Agl crystallises in cubic close packed ZnS structure. What fraction of tetrahedral sites are occupied by Ag+ ions?

    In AgI, if there are nI- ions, there will be nAg+ ions. As I- ions form the lattice, number of tetrahedral voids = 2n.
    As there are nAg+     ions to occupy these voids, therefore fraction of tetrahedral voids occupied by Ag+ ions = n/2n = ½ = 50%.
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    96. Write the formula of a compound which is made of two elements A and B. Atom A forms close-packed lattice while atom B occupies all tetrahedral voids.
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    97. What is possible formula of a compound which is made of two elements P and Q and forms fcc structure. Atoms P occupy corner positions and Q occupy face positions of cube?
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    98. What is the general structure of ionic solids?
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    99. How many octahedral voids are there in 1 mole of a compound having cubic closed packed structure? 
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    100.

    What is the two-dimentional coordination number of a molecule in square closed packed layer ?

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