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Name the non-stoichiometric point defect...

Name the non-stoichiometric point defect responsible for the colour of alkali metals halides.

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Metal excess or anionic vacancies or F-centres, which is due to electrons entrapped in anionic vacancies.
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All real structures are three dimensional structures. They can be obtained by stacking two dimensional layers one above the other while placing the second square dose packed layer above the first we follow the same rule that was followed when one row was placed adjacent to the other. The second layer is placed over the first layer such that the spheres of the upper layer are exactly above there of the first layer. In his arrangement spheres of both the layers are perfectly aligned horizontally as well as vertically. A metallic element crystallise into a lattice having a ABC ABC pattern and packing of spheres leaves out voids in the lattice. Name the non-stoichiometric point defect responsible for colour in alkali metal halides.

What type of non-stoichiometric point defect is responsible for the pink colour of LiCl ?

Non-Stoichiometric defect

Which is responsible for the blue colour of alkali metals in liquid ammonia?

(i) What type of non stichiometirc point defect is responsible for the pink colour of LiCI? (ii)What type of stochiometric defects is shown by NaCI?

Why Frenkel defects are not found in pure alkali metal halides?

PRADEEP-STATES OF MATTER: SOLID MATTER-ADDITIONAL QUESTIONS (VERY SHORT ANSWER )
  1. What is the difference between 13-15 and 12-16 compounds ?

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  2. f-centre is

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

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  4. Name the type of defect that occurs in the crystals of zinc sulphide.

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  5. Which point defect in crystals does not alter the density of the relev...

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  6. Which point defect in crystals of a solid decreases the density of the...

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  7. Which stoichiometric defect in crystals increses the density a solid?

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  8. intrinsic and extrinsic semiconductor

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  9. What type of semi-conductors is produced when silicon is doped with ar...

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  10. How do paramagnetic substances differ from ferromagnetic ?

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  11. What happens when a ferromagnetic or anti-ferromagnetic or a ferrimagn...

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  12. Ferromagnetic subtances make permanent magnets. Give reason.

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  13. What happens when ferrimagnetic Fe3O4 is heated to 850 K and why ?

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  14. What happens when ferromagnetic substance is heated to high temperatur...

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  15. What type of substances exhibit antiferromagnetism ?

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  16. How is electrical conductivity caused in (a) semiconductors, (b) metal...

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  17. How do the electrical conductivity and resistivity of the following cl...

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  18. How may the conductivity of an intrinsic semiconductor be increased ?

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  19. What is energy gap in band theory ? Compare its size in conductors, se...

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  20. What type of substances would make better permanent magnets, ferromagn...

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