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An excess of potassium ions makes KCl cr...

An excess of potassium ions makes KCl crystal appear violet or lilac in colour since-

A

some anionic sites are occupied by an unpaired electron

B

some anionic sites are occupied by a pair of electrons

C

there are vacancies at some anionic sites

D

F-centres are created which impart colour to the crystals

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The correct Answer is:
A, D
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CHHAYA PUBLICATION-SOLID STATE-SOLVED NCERT EXEMPLAR PROBLEMS
  1. Which of the following defects is also known as dislocation defect-

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  2. In the cubic close packing, the unit cell has-

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  3. The edge lengths of the unit cells in terms of the radius of spheres c...

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  4. Which of the following represents correct order of conductivity in sol...

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  5. Which is not true about the voids formed in three dimensional hexagona...

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  6. The value of magnetic moment is zero in the case of anti-ferromagnetic...

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  7. Which of the following statements are not true-

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  8. Which of the following are true about metals-

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  9. Under the influence of electric field, which of the following statemen...

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  10. Which of the following statements are true about semiconductors-

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  11. An excess of potassium ions makes KCl crystal appear violet or lilac i...

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  12. No. of tetrahedral voids per unit cell in NaCl crystal is-

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  13. Amorphous solid can also be called-

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  14. A perfect crystal of silicon is doped with some elements as given in t...

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  15. Which of the following statements are correct-

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  16. Which of the features are not shown by quartz glass-

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  17. Which cannot be regarded as molecular solid-

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  18. In which of the following arrangements octahedral voids are formed-

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  19. Frenkel defect is also known as-

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  20. Which of the following defects decrease the density-

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