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why does table salt ,NaCl sometimes...

why does table salt ,NaCl sometimes appear yellow in colour?

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Due to F-centres in which electrons are present in the anion vacancies.
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CENGAGE CHEMISTRY ENGLISH-NCERT BASED EXERCISE-Short Answer Type Questions
  1. Give the name of one solid which shows both Schottky and Frenkel defec...

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  2. why is Frenkel defects not found in pure alkali metal halides ?

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  3. why does table salt ,NaCl sometimes appear yellow in colour?

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  4. How do the electrical conductivity and resistivity of metallic conduct...

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  5. What is energy gap in bond theory?

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  6. What is photo voltaic cell?

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  7. What happens when ferrimagnetic Fe(3)O(4) is heated to 850 K?

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

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  9. Which type of defect is product when NaCl is dopped with AlCl(3)?

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

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  11. At what temperature range most of the metals becomes superconductors

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  12. What is curie temperature?

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

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  14. Why does Frenkel defect not change the density of AgCl crystals?

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  15. What other elements may be added to silicon to make electrons availabl...

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  16. What are the types of lattice imperfection found in crystals?

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  17. What is dislocation in the crystals

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  18. Which transition metal oxide has appearance and conductivity like that...

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

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  20. Name the compound which shows both electric and ferroelectric proporti...

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