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What is F-centre? Why is it called colou...

What is F-centre? Why is it called colour centre? What kind of defect is associated with F-centres?

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CHHAYA PUBLICATION-SOLID STATE-WARM UP EXERCISE
  1. What type of stoichiometric defect are shown by the following compound...

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  2. What are non-stoichiometric defects in an ionic crystal? Explain how m...

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  3. What is F-centre? Why is it called colour centre? What kind of defect ...

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  4. Why does the colour of NaCl turn yellow when it is heated in an atmosp...

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  5. How are vacancies created in the crystal lattice of NaCl when a small ...

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  6. What will be the number of cation vacancies if 10^(-3) mol% of CdCl(2)...

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  7. Based on band theory, explain why metals are good conductors of electr...

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  8. Explain with the help of band theory why a semiconductor is neither a ...

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  9. In terms of band theory, what is the difference (i) between a conducto...

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  10. What are intrinsic and extrinsic semiconductors? Give two examples of ...

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  11. (a) On raising the temperature, electrical conductivity of a metal dec...

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  12. Write two ways by which the electrical conductivity of a semiconductor...

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  13. What are n-type and p-type semiconductors?

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  14. Why is the electrical conductivity of phosphorus-doped silicon is more...

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  15. Mention the type of semiconductor (n-type or p-typr) that is formed wh...

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  16. Why does a substance exhibit magnetic property?

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  17. What are paramagnetic substances? What is the reason of paramagnetism?...

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  18. What are diamagnetic substances? Give two examples of this substance. ...

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  19. Define: (i) ferromagnetic (ii) ferrimagnetic and (iii) anti-ferromagne...

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  20. Which of the following substances can exist in a permanently magnetise...

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