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Name the type of defect that occurs in t...

Name the type of defect that occurs in the crystals of zinc sulphide.

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Crystals of zinc sulphide (ZnS) suffer from Frenkel defect.
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An ideal crystal has the same unit cell containing the same lattice points throughout the whole of crystal. But such ideal crystals exist only at 0 K temperature. However, during the formation of crystal structure, certain defects are produced. These defects are point defects, line defects, vacancy defects, interstitial defects or impurity defects. Due to these defect, the crystals exhibit different properties. Presence of delocalised electrons make the metals conductor of electricity . Germanium and silicon are the most important commericial semiconductors. By adding impurities such as arsenic and boron, n and p - type semiconductors can be synthesised. Various combinations of n and p type semiconductors are used to make electronic components. Name the type of point defect that occurs in a crystal of zinc sulphide. Will it increase, decrease or not change the density ?

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DINESH PUBLICATION-SOLID STATE-QUESTION FROM BOARD EXAMINATION
  1. What is the number of atoms per unit cell in a body centred cubic stru...

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  2. Why is phosphours doped silicon a semi-conductor?

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  3. Name the type of defect that occurs in the crystals of zinc sulphide.

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  4. How may octahedral voids are present in 1 mole of a compound having cu...

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  5. A compound formed by two elements M and N. Element N forms ccp and ato...

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  6. What is the total number of atoms per unit cell in a face centred cubi...

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  7. What type of substances exhibit antiferromagnetism ?

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  8. Why Frenkel defects are not found in pure alkali metal halides?

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  9. What types of allignments in crystals make them ferromagnetic ?

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  10. To get a n- type semiconductor from silicon , it should be doped...

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  11. Which point defect in crystals does not alter the density of the relev...

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  12. How do metallic and ionic substances differ in conducting electricity ...

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  13. What type of interactions hold together the molecules in a polar cryst...

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  14. Write a distinguishing feature of metallic solids.

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  15. What type of semiconductor results when highly purified silicon is dop...

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  16. Crystalline solids are anisotropc in nature. What does this statement ...

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  17. Distinguish between intrinsic and extrinsic semi-conductors on the bas...

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  18. What are semi-conductors ? Describe the two main types of semi- conduc...

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  19. KF has ccp structure. Calculate the radius of the unit cell if the edg...

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  20. Give reason : (a) Why is Frenkel defect found in AgCl ? (b) What i...

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