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Which type of ionic substances show Scho...

Which type of ionic substances show Schottky defect in solids ?

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Schottky defects are more common in ionic compounds with high co-ordination number and where the sizes of positive and negative ions are almost equal. e.g., NaCl
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What is Schottky defect ?

Examine the given defective crystal and {:(A^(+),B^(-),A^(+),B^(-),A^(+)),(B^(-),0,B^(-),A^(+),B^(-)),(A^(+),B^(-),A^(+),0,A^(+)),(B^(-),A^(+),B^(-),A^(+),B^(-)):} Answer the following questions : (i) What type of stoichiometirc defect is shown by the crystal ? (ii) How is the density of the crystal affected by this defect ? (iii) What type of ionic substances show such defect ?

Which type of substance wxhibit anti ferromagnetism ?

Name the ionic solid which shows both Schottky defect and Frenkel defect.

Which type of Stoichmetric defect is shown by the following solids? a) AgCl b) KCl

Due to Frenkel defect, the density of the ionic solids ……… while due to Schottky defects, density ………. .

Which of the following is not correct consequence of Schottky defects ?

Assertion (A) : The density of crystal having Schottky defect is lowered. Reason (R ) : The crystals suffering from Schottky defect have same number of cation and anions missing from their normal lattice sites.

OSWAAL PUBLICATION-SOLID STATE-TOPIC -2 (VERY SHORT ANSWER TYPE QUESTIONS )
  1. Mention one property which is caused due to the presence of F-centre i...

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  2. What are paramagnetic materials ? Give examples.

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  3. Define ferromagnetism.

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  4. Which point defect decreases the density of a solid ?

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  5. Express the relationship between atomic radius (r) and edge length (a)...

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  6. What type of stoichiometric defect is shown by AgCl ?

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  7. What type substances would make better permanent magnets, ferromagneti...

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  8. On heating a crystal of KCl in potassium vapour, the crystal starts ex...

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  9. Which type of ionic substances show Schottky defect in solids ?

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  10. What is meant by 'doping' in a semiconductor ?

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  11. How is the conductivity of an intrinsic semiconductor be increased ?

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  12. Which stoichiometric defect increases the density of a solid ?

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  13. What type of stoichiometric defect is shown by AgBr and AgI ?

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  14. What type of defect can arise when a solid is heated ?

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  15. Why does LiCl acquire pink colour when heated in Li vapours ?

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  16. What are n-type semiconductors ?

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  17. Which type of substance wxhibit anti ferromagnetism ?

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  18. What type of semiconductor is obtained when silicon is doped with arse...

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  19. Give an example of an ionic compound which shows Frenkel defect.

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  20. Which point defect in crystals of a solid does not change the density ...

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