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Why does KCl become violet in colour whe...

Why does KCl become violet in colour when it is heated in presence of potassium vapour?

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CHHAYA PUBLICATION-SOLID STATE-EXERCISE
  1. What are non-stoichiometric defects? Give two example of such defects.

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  2. Why aren't Frenkel defects observed in pure halides of alkali metals?

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  3. Why does KCl become violet in colour when it is heated in presence of ...

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  4. What do you understand by a tetrahedral void in a close-packed structu...

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  5. What do you understand by an octahedral void in a close-packed crystal...

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  6. Metallic Zn has a hexagonal close-packed array of Zn atoms. How many v...

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  7. What type of semiconductor (n-or p-type) is formed when pure Ge is dop...

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  8. What type of semiconductor (n- or p-type) is formed when pure Si is do...

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  9. Why does the electrical conductivity of semiconductors increase with r...

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  10. Why is the electrical conductivity of metals found to decrease with ri...

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  11. Why does the electrical conductivity of germanium crystal increase whe...

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  12. Write the differences between crystalline and amorphous solids.

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  13. On the basis of the nature of constituent particles, how are crystalli...

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  14. Between square and hexagonal close packing in two dimensions, which on...

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  15. Define: (i) Cubic close-packed structure (ii) Hexagonal close-packed s...

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  16. Show that 26% of the total volume of a face-centred cubic unit cell re...

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  17. Show that the number of octahedral voids in a ccp or an hcp structure ...

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  18. Explain how the electrical neutrality of an ionic crystal is maintaine...

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  19. Table salt (NaCl), which is essentially white in colour, is found yell...

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  20. ZnO is white in colour, but when it is heated its colour turns yellow....

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