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The Solid State

Short 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?

It is the empty space between three spheres in one layer and one sphere in the layer above it or one sphere in the layer below it is called a tetrahedral void
.

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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 ?

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