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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-OBJECTIVE EXERCISE -2
  1. If one mole of AgCl is dopped with 10^(-5) mole of AICI3, the number ...

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  2. NaCZ is doped with 2 xx 10^(-2) mole% of SrCl(2) then the number of ca...

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  3. A solid solution of CdBr(2) in AgBr contains

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  4. Schottky defect in crystals is observed when

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  5. Which among the following is likely to have Schottky defect.

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  6. What type of crystal defect is indicated in the diagram below  |{:(Na...

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  7. In NaCl number of Schottky pairs and number of ions per 1 cc is about ...

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

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  9. The magnetic behavior is different from others in

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  10. Which of the following is correct statement

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

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  12. Which of the following are diamagnetic in vapour state( A) Sodium meta...

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  13. At w hich tem perature, Fe(3)O(4) is a fe rri­magnetic solid converted...

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

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  16. Correct statements regarding F-centres are (a) they impart magnetic pr...

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  17. The material used in solar cells contains

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

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  19. The oxide that does not act as an insulator even by a change in temper...

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  20. Observe the following statements (i) Silicon doped with P is a p-type ...

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