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Schottky defect in crystals is observed ...

Schottky defect in crystals is observed when

A

Unequal number of cations and anions are missing from the lattice

B

Equal number of cations and anions are missing from the lattice

C

An ion leaves its normal site and occupies an interstitial cells

D

Density of the crystal is increased

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The correct Answer is:
B
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Schottkey defects -

Schottky defect causes

Schottky defect does not causes

(A) The presence of a large number of Schottky defects in NaCZ lowers its density. (R) In NaCZ, there are approximately 10^(6) Schottky pairs per 1 cm3 at room temperature.

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

When stopping potential is applied in an experiment of photoelectric effect, no photocurrent is observed. This means that

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

What is Schottky defect ?

(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

AAKASH SERIES-SOLID STATE-LEVEL - I (EXERCISE - II)
  1. Which among the following is likely to have Schottky defect.

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  2. (A) : During vacancy defect the density of solid decreases (R): The ...

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  3. Schottky defect in crystals is observed when

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  4. {:("List - I","List - II"),("A) Crystal defect","1) Amorphous"),("B) C...

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  5. Which of the following is a ''Berthollide Compound''?

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  6. To get n-type semiconductor, impurity to be added to silicon should ha...

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  7. The mechanism of electrical conductivity may be given in terms of

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  8. The oxide that is insulator is

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  9. In which of the following the conductivity would be in the order of 10...

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  10. Which one of the following ratio gives the purity of the metal (rho-re...

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  11. Germanium can be made n-type semi conductor by doping with

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  12. Which one of the following statements is wrong

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  13. The magnetic behavior is different from others in

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  14. The magnetic susceptibility of a substance can be expressed as

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  15. Which of the following is correct statement

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  16. The general formula of ferrites is MFe(2)O(4). Where 'M' would not be

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  17. Which substance shows anti ferro magnetism?

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  18. The alignment of magnetic dipoles shown below uarr darr darr uarr darr...

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  19. {:("List - I","List - II"),("A) Crystal defect","1) Amorphous"),("B) C...

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  20. (A) : With increase in temperature the condicutivity of metals decreas...

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