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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.

On heating some covalent bonds among silicon atoms break on heating and electrons become free to move under applied field, hence silicon behaves like semi-conductor at high temperature.

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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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