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(A) Crystals exhibiting Frenkel type def...

(A) Crystals exhibiting Frenkel type defects do not show any change in density due to defect (R) In Frenkel defect the interstitial cations and cation vacancies are equal in number

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

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The correct Answer is:
A
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Due to Frenkel defect, the density of the ionic solids

Explain the following terms with suitable examples: (i) Schottky defect (ii) Frenkel defect (iii) Interstitials and (iv) F-centres.

(A) Schottky and Frenkel defects are also called thermodynamic defects (R) Both Schottky and Frenkel defects increases with increase in temperature.

(A) Frenkel defects are found in silver halides (R) Frenkel defects are commonly found in ionic solids

(A) In any ionic solid with Schottky defects the number of positive and negative ions is same. (R) Equal number of cation and anion vacan­cies are present

(A) Schottky type defect is shown by crystals with high coordination number. (R) In crystals with Schottky defect cations always occupy interstitial positions

(A) Zinc oxide is yellow coloured when hot (R) Zinc oxide has metal excess defect due to anionic vacancies

Ionic lattice has two major point defects, (1) Schottky (2) Frenkel defects, Schottky defects occurs due to the cation - anion pairs missing from the lattice sites, Frenkel defects occur when an ion leaves its lattice site and fits into an interstitial space. The neutrality of the crystals is being maintained and we considered all losses from interstitial postions Which defect decreases density of the crystal ?

Ionic lattice has two major point defects, (1) Schottky (2) Frenkel defects, Schottky defects occurs due to the cation - anion pairs missing from the lattice sites, Frenkel defects occur when an ion leaves its lattice site and fits into an interstitial space. The neutrality of the crystals is being maintained and we considered all losses from interstitial postions Structure shown here represents

AAKASH SERIES-SOLID STATE-OBJECTIVE EXERCISE -4
  1. (A): ABAB ..... pattern of close packing gives hcp arrangement (R): ...

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  2. (A) Schottky type defect is shown by crystals with high coordination n...

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  3. (A) Crystals exhibiting Frenkel type defects do not show any change in...

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  4. (A) Glass is an amorphous solid (R) Glass has an irregular, random arr...

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  5. (A) Diamond and graphite do not have same crystal structure. (R) Diamo...

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  6. (A) Space or crystal lattice differ in symmetry of the arrangement of ...

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  7. (A) In close packing of spheres a tetrahedral void is surrounded by fo...

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  8. (A) The presence of a large number of Schottky defects in NaCZ lowers ...

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  9. (A) Frenkel defects are found in silver halides (R) Frenkel defects a...

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  10. (A) Electrical conductivity of semiconductors increases with increasin...

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  11. (A) On heating ferromagnetic or ferrimagnetic substances, they become ...

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  12. (A) Insulators are generally good conductors (R) Insulators have free...

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  13. (A) Anti ferromagnetic substances posses zero magnetic moment. (R) MnO...

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  14. (A) Ionic solids conduct electricity in solid state. (R) Their conduct...

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  15. (A) Ionic solids are characterized by high melting and boiling point. ...

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  16. (A) Molecular solids are characterized by low melting point. (R) Molec...

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  17. (A) Amorphous Substances are isotropic (R) Properties like refractive ...

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  18. (A) Conductivity of silicon increases by doping it with group-15 eleme...

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  19. (A) Cadmium sulphide is perfectly covalent (R) The difference of elect...

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  20. (A) Crystalline solids are anisotropic in nature (R) Crystalline subs...

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