What is unit cell.

Unit cell: It is the smallest repeated unit in a crystal lattice e.g., in sodium chloride and caesium chloride, the unit cell is a cube. It has all the characteristic properties of crystal.
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What will happen if NaCl crystal is subjected to high pressure?

It will change to CsCI structure i.e.At High pressure the coordination number change from 6:6 to 8:8 .
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What is the effect of increasing temperature on the conductivity of semi-conductors?

In case of semiconductors, the gap between the valence band and conduction band is small  Therefore, some electrons may jump to conduction band and show some conductivity. Electrical conductivity of semiconductors increases with rise in temperature, since more electrons can jump to the conduction band.
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What type of structure possessed by a unit cell of CsCl.


CsCl has a body centred cubic structure.
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For tetrahedral co-ordination, what should be the range of radius ratio (r+/r) value?

For tetrahedrtal coordination Radius ratio is 0.225-0.414.
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