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In a Schottky defect...

In a Schottky defect

A

cations are missing from the lattice sites and occupy the interstitial sites

B

equal number of cations and anions are missing

C

anion are missing and electrons are present in their place

D

equal number of extra cations and electrons are present in the interstitial sites

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The correct Answer is:
B
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Defects which do not disturb the stoichiometry are called stochiometric defect. At the time of crystal formation an ion may not occupy its expected position leaving a void or hole at that site. As a metter of fact one positive and one negative ion are missing from their respective positions leaving behind a pair of holes. This vacancy is a Schottky defect. Due to this defect density decreases. Defect arises in which certain atoms or ions have migrated to interstitial position some distance removed from the holes which they vacated. In this case there is no change in the density of the crystal. In the Schottky defect

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RESONANCE ENGLISH-SOLID STATE-Exercise -2 (Part-I)
  1. Which of the following are not correctly matched with the bonds found ...

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  2. Which of the following is not correct for ionic solids ?

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  3. An element with atomic mass 100 has a bcc structure and edge length 40...

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  4. What is the nearest distance between two different layers in ABAB arra...

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  5. In a face centered lattice of X and Y, X atoms are present at the corn...

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  6. You are given 6 identical balls . The maximum number of square voids a...

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  7. In a simple cubic lattice of anions, the side length of the unit cell ...

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  8. In a multi layered close-packed structure

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  9. In a compound,oxide ions are arranged in cubic close packing arrangeme...

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  10. Platinum crystallize in a face-centred cubic crystal with a unite cell...

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  11. Platinum crystallises in a face centered cube crystal with a unit cell...

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  12. Gold has a face centered cubic lattice with an edge length of the unit...

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  13. Which of the following statements is correct in the rock-salt structur...

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  14. The compound AB crystallizes in a cubic lattice in which both A and B ...

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  15. BaO has a rock-salt type structure. When subjected to high pressure, t...

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  16. A crystal of NaCl, which has sodium ions and chloride ions missing fro...

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  17. In a Schottky defect

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  18. NaCl shows Schottku defects and AgCl Frenkel defects. The electrical c...

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  19. Zinc oxide, white in colour at room temperature, acquires yellow colou...

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