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Why LiCl acquires pick colour when heate...

Why LiCl acquires pick colour when heated in Li vapours ?

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On heating LiCl in Li vapours, the excess of Li atoms deposit on the surface of the crystal. The `Cl^(-)` ions diffuse to the surface of the crystal and combine with Li atoms diffuse into the crystal and get trapped at anion vacancies called F-centres. These absorb energy from visible light and radiate pink colour.
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MODERN PUBLICATION-SOLID STATE-CONCEPTUAL QUESTIONS 2
  1. What type of stoichiometric defect is shown by NaCl ? Explain.

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  2. Analyses shows that FeO has a non-stoichiometric composition with form...

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  3. Following is the schematic alignment of magnetic moments : Ident...

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  4. Name any one solid in which both Frenkel and Schottky defects occur.

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  5. What is the effect of temperature on the conductivity of metals and se...

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  6. Why is Frenkel defect not found in pure alkali metal halides ?

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  7. What is the effect of Schottky defect on the density of crystal ?

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  8. What is the difference in the semi - conductors obtained by doping sil...

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  9. Identify the type of defect shows in the following figure : What typ...

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  10. What type of semiconductor is obtained when : (i) Ge is doped with ...

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  11. Name the compound that can be added to AgCl so as to produce cation va...

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  12. Which point defect lowers the density of a crystal?

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  13. How does the electrical conductivity of super- conductors vary with te...

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  14. Name the non-stoichiometric point defect responsible for the colour of...

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  15. Give reason : (a) Why is Frenkel defect found in AgCl ? (b) What i...

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  16. Why does ZnO appear golden yellow at high temperature ? Explain.

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  17. The electrical conductivity of a metal decreases with rise in temperat...

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  18. Why does zinc oxide exhibit enhanced electrical conducity on heating ?

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  19. Out of NaCl and AgCl, which one shows Frenkel defect and why ?

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  20. Why LiCl acquires pick colour when heated in Li vapours ?

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