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How would you explain that (i) non-stoic...

How would you explain that (i) non-stoichimetric NaCl is yellow, (ii) non-stoichiometric ZnO is yellow ?

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The correct Answer is:
The reason of both is the presence of electron in anionic vacancies which is known as F-center
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RESONANCE-SOLID STATE-Exercise -1
  1. The intermetallic compound LiAg crystallizes in cubic lattice in which...

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  2. Chromium metal crystallizes with a body-centred cubic lattice. The len...

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  3. In which type of 3D arrangement have 1^(st) and IV layer's of sphere a...

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  4. Metallic magensium has a hexagoanl close-packed structure and a densit...

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  5. Consider a corner atom of Ist layer of an HCP unit cell showing altern...

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  6. Following figure shows an FCC unit cell with atoms of radius r market ...

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  7. Aluminium metal (atomic weight = 27 g) crystallises in the cubic syste...

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  8. Tom' cat arranges the glass balls, in a particular 3D array, that two ...

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  9. A student wants to arrange 4 identical spheres (of radiusR) on a two d...

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  10. Illustrate an octahedral void in the close packing of spheres. Why is ...

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  11. The number of tetrahedral and octahedral voids in hexagonal primitive ...

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  12. What is the number and closest distance between two octahedral voids a...

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  13. Suggest the probable structures of the unit cells of the following eac...

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  14. Why does ZnS not crystallize in the NaCl structure ?

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  15. Try to answer the following: (i) In Zinc Blende structure there is o...

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  16. KBr crystallizes in NaCl type of unit cell. K^(+) radius = 1.33Å, Br^(...

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  17. What do you understand by imperfections in ionic crystals? Name the ty...

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  18. How would you explain that (i) non-stoichimetric NaCl is yellow, (ii) ...

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  19. Account the following : Silicon is an insulator but silicon doped with...

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  20. How does the conductivity of a semiconductor change if its temperature...

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