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Inspite of long range order in the arrangement of particles why are the crystals usually not perfect ?

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Crystals have long range order which means that the constituent particles have a regular orderly arrangement throughout. However, the crystals usually suffer from certain defects which are of different type and generally arise during the process of crystallisation. That is why, these are not perfect for further details.
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DINESH PUBLICATION-SOLID STATE-N.C.E.R.T
  1. why are liquids and gases categorised as fuids ?

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  2. why are solids incompressible ?

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  3. Inspite of long range order in the arrangement of particles why...

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  4. Why common salt (NaCl) sometimes appear yellow?

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  5. why is Fe0(s) not formed in stoichiometric compostion ?

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  6. why does white Zn0(s) becomes yellow upon heating ?

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  7. why does the electrical conductivity of semiconductors increse w...

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  8. Expalin why does conductivity of germainum crystals increase on ...

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  9. In a compound, nitrogen atoms (N) make cubic close packed lattice and ...

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  10. Under which situations can an amorphous substance change to cryst...

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  11. Explain the structure of neuron with the help of a labelled diagram.

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  12. Show that in a cubic close packed structure, eight tetrahedral voids a...

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  13. How does the doping increase the conductivity of semiconductor ?

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  14. A sample of ferrous oxide has actual formula Fe(0.93)O(1..00). In this...

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  15. Frenkel defect is not found in the halides of alkali metals. Assign re...

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  16. What is difference in bahavior between glass and sodium chloride would...

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  17. A metallic crystal cystallizes into a lattice containing a sequence of...

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  18. Schottky defect lowers the density of ionic crystals while Frenkel def...

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  19. why does white Zn0(s) becomes yellow upon heating ?

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  20. Crystals possessing CsCl structure change to NaCl structure upon heati...

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