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Home
Class 12
CHEMISTRY
Name the crystal defect which lowers the...

Name the crystal defect which lowers the density in an ionic crystal

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Text Solution

Verified by Experts

Schottky defect.
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Knowledge Check

  • Which one of the following is a covalent crystal?

    A
    Rock salt
    B
    Ice
    C
    Quartz
    D
    Dry ice

  • Which one of the following is a molecular crystal?

    A
    Rock salt
    B
    Quartz
    C
    Dry ice
    D
    Diamond

  • Which one of the following is a molecular crystal ?

    A
    Rock salt
    B
    Quartz
    C
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    D
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    In a tetragonal crystal

    The addition of CaCl_(2) crystal to KCl crystal a. Lowers the density of the KCl crystal b. Raises the density of the KCl crystal c. Does not affect the density of the KCl crystal d. Increases the Frenkel defects of the KCl crystal

    The addition of CaCl_(2) to a KCl crystal lowers the density of the KCl crystal.

    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 ?

    (a) Sodium metal crystallizes in bcc structure. Its unit cell edge length is 420 pm. Calculate its density. (Atomic mass of sodium = 23 u, N_(A) = 6.022 xx 10^(23) mol^(-) ). (b) What is Frenkel defect ? How does it affect the density of a crystal ?

    OSWAAL PUBLICATION-SOLID STATE-TOPIC -2 (VERY SHORT ANSWER TYPE QUESTIONS )
    1. Name the crystal defect which lowers the density in an ionic crystal

      01:34

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    2. What is Frenkel defect? Give an example.

      03:14

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    3. Define radius ratio.

      01:21

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    4. Mention one property which is caused due to the presence of F-centre i...

      02:34

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    5. What are paramagnetic materials ? Give examples.

      02:04

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    6. Define ferromagnetism.

      02:51

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

      03:38

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

      05:02

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

      02:53

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

      04:40

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

      02:47

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

      02:04

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

      02:12

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

      02:45

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

      02:34

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

      03:02

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

      01:28

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

      02:49

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    19. What are n-type semiconductors ?

      03:16

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    20. Which type of substance wxhibit anti ferromagnetism ?

      02:28

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