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Why does the colour of NaCl turn yellow ...

Why does the colour of NaCl turn yellow when it is heated in an atmosphere of Na-vapour?

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CHHAYA PUBLICATION-SOLID STATE-WARM UP EXERCISE
  1. What are non-stoichiometric defects in an ionic crystal? Explain how m...

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

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

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

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

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

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

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

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

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

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

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

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

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

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  15. Why does a substance exhibit magnetic property?

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

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

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

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

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  20. Why does an anti-ferromagnetic substance have zero resultant magnetic ...

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