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?
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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 ?
Short Answer Type
