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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 repated paattern of arrangemt of constituent particles but in the process of cryatallisation some deviations from the ideal arrangement (i.e., defects) may be introdiced therefore , crystals are usually not perfect .
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NCERT EXEMPLAR-SOLID STATE-Solid State
  1. why are liquids and gases categorised as fuids ?

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  2. why are solids incomressible ?

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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. A compound formed by two elements M and N. Element N forms ccp and ato...

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

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  11. match the defects given in column I with the statements in given...

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  12. match the type of unit cell given column I with the features iv...

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  13. match the types of defect given in column I with the statement...

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  14. match the items given in column I with the items given in colum...

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  15. Match the type of packing given in column I with the iterms give...

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  16. Assertion :- (a) the total number of atoms present in a simple c...

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  17. Assertion :- (A) Graphite is good conductor of electricity however ...

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  18. Assertion :- (A) total number of octahedral voids present in ...

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  19. Assertion :- (A) the paking efficiency is maximum for the fcc stru...

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  20. Assertion :-(A) semiconductors are solids with conductivites in t...

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