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Name a crystalline solid which is likely...

Name a crystalline solid which is likely to develop both Schottky and Frenkel defects.

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Silver bromide (AgBr).
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Explain Schottky and Frenkel defects.

Differentiate between Schottky and Frenkel defect.

Which has Frenkel defect ?

Mention two differences between Schottky and Frenkel defects.

(a) A crystalline compound formed by element A and B has face-centred cubic unit cell. The corners and the face centres are occupied by A and B atoms respectively. If one of the corner atoms is found missing then what would be the formula of the compound? (b) Give an example of a compound which exhibits both Schottky and Frenkel defects.

What is Frenkel defect? What type of ionic solids are likely to develop this defect? Why does the presence of Frenkel defect in a crystal not affect the density of the crystal?

Explain Schottky defect in Stoichiometric crystals. What are the consequences of Schottky and Frenkel defects in crystals ?

What is stoichiometric defect? What kind of defects are Schottky and Frenkel defects? Which one of these two defects is associated with decrease in density of the crystal, and which one is associated with no change in density? Give reasons.

Give reasons : (i) In stoichiometric dfects. NaCl exhibits Schottky defect and not Frenkel defect. (iii) Ferrimagnetic substances show better magnetism than antiferromagnetic substances.

In an ideal crystal, the entropy of the constituents at absolute zero temperature (0K) is zero. However, the crystals generally suffer from certain defects also called imperfections They may be both electronic and atomic in nature. The atomic imperfections may be stoichiometric (Schottky and Frenkel defects) or non-stoichiometric (metal excees and metal deficiency defects). In addition to these, there are impurity defects which are caused by the addition of certain impurities of metals and this is known as dopping. The dopping leads to semi conductors which may be either n-type or p-type in nature. Zinc oxide (ZnO) is white when cold and yellow when hot. It is due to the development of :

CHHAYA PUBLICATION-SOLID STATE-VERY SHORT ANSWER TYPE
  1. Which of the following defects in a non-ionic crystal causes increase ...

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  2. Which defect causes decrease in density of an ionic crystal, Schottky ...

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  3. Name a crystalline solid which is likely to develop both Schottky and ...

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  4. Which defect in an ionic crystal is a combination of a vacancy defect ...

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  5. What type of defect arises in non-stoichiometric sodium chloride forme...

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  6. What type of defect arises in non-stoichiometric zinc oxide formed whe...

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  7. Arrange the following solids in order of their increasing electrical c...

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  8. An n-type semiconductor is produced when pure Si or Ge is doped with a...

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  9. What type of semiconductor (n-type or p-type) is formed when pure Ge i...

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  10. Between a semiconductor and a metal, whose electrical conductivity dec...

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  11. A substance when placed in a magnetic field in strongly attraceted by ...

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  12. Rank the following magnetic substances in order of their magnetic mome...

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  13. Name an ionic compound, a trace amount of which when added into the cr...

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  14. What is the coordination number of a particle in a crystalline solid w...

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  15. How can you distinguish a metal and an ionic solid on the basis of the...

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  16. What kind of intermolecular forces of attraction hold the molecules in...

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  17. "Crystalline solids are anisotropic" - What does this statement mean?

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  18. Apart from the metallic lustre, mention one property by which one can ...

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  19. How is it possible to enhance the electrical conductivity to an intrin...

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  20. Which type of magnetism does the following arrangement of magnetic mom...

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