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(A) Conductivity of silicon increases by...

(A) Conductivity of silicon increases by doping it with group-15 elements. (R) Doping means introduction of small amount of impurities like P, As or Bi into the pure crystal.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
B
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Read the following passage and answer the questions at the end of it. Conductivity of silicon increases if it is doped with certain other elements. Doping means introduction of small amount of impurities like phosphorus, arsenic or boron in the pure crystal. In pure silicon four valencies are used in bonding with other four adjacent silicon atoms. When a silicon crystal is doped with a group - 15 element (with five valence electrons) such as P, AsSb or Bi, the structure of the crystal lattice remains unchanged. Out of the five valence electrons of group - 15 doped element, four electrons are used in normal covalent bonding with silicon and fifth electron is delocalised and thus conducts electricity Doping a silicon crystal with a group-13 element (with three valence electron) such as B, Al, Ga or In produces a semiconductor with three electrons in dopant. The place where fourth electron is missing is called as electron vacancy or hole. Silicon that has been doped with group - 15 elements is called

Read the following passage and answer the questions at the end of it. Conductivity of silicon increases if it is doped with certain other elements. Doping means introduction of small amount of impurities like phosphorus, arsenic or boron in the pure crystal. In pure silicon four valencies are used in bonding with other four adjacent silicon atoms. When a silicon crystal is doped with a group - 15 element (with five valence electrons) such as P, AsSb or Bi, the structure of the crystal lattice remains unchanged. Out of the five valence electrons of group - 15 doped element, four electrons are used in normal covalent bonding with silicon and fifth electron is delocalised and thus conducts electricity Doping a silicon crystal with a group-13 element (with three valence electron) such as B, Al, Ga or In produces a semiconductor with three electrons in dopant. The place where fourth electron is missing is called as electron vacancy or hole. Silicon that has been doped with group - 13 elements is called

Read the following passage and answer the questions at the end of it. Conductivity of silicon increases if it is doped with certain other elements. Doping means introduction of small amount of impurities like phosphorus, arsenic or boron in the pure crystal. In pure silicon four valencies are used in bonding with other four adjacent silicon atoms. When a silicon crystal is doped with a group - 15 element (with five valence electrons) such as P, AsSb or Bi, the structure of the crystal lattice remains unchanged. Out of the five valence electrons of group - 15 doped element, four electrons are used in normal covalent bonding with silicon and fifth electron is delocalised and thus conducts electricity Doping a silicon crystal with a group-13 element (with three valence electron) such as B, Al, Ga or In produces a semiconductor with three electrons in dopant. The place where fourth electron is missing is called as electron vacancy or hole. If NaCl is doped with 10^(-3)" mol % " SrCl_(2) then concentration of cation vacancies is

An-type and P-type silicon can be obtained by doping pure silicon with

The element that can be used as acceptor impurity to dope silicon is

A group 14 elements is to be converted into n- type semiconductor by doping in with a suitable impurity. To which group shouyld theis impurity belong ?

AAKASH SERIES-SOLID STATE-OBJECTIVE EXERCISE -4
  1. (A) Molecular solids are characterized by low melting point. (R) Molec...

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  2. (A) Amorphous Substances are isotropic (R) Properties like refractive ...

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  3. (A) Conductivity of silicon increases by doping it with group-15 eleme...

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  4. (A) Cadmium sulphide is perfectly covalent (R) The difference of elect...

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  5. (A) Crystalline solids are anisotropic in nature (R) Crystalline subs...

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  6. (A) Packing efficiency of hep and CCP are not equal (R) hep, ccp both ...

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  7. (A) Visible light can not be used to study crystals (R) The wave lengt...

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  8. (A) All covalent solids are non conductors (R) Graphite is a ionic so...

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  9. (A) I(2), CO(2) have low melting point (R) I(2), CO(2) have weak disp...

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  10. (A) Metallic solids are electrical and thermal conductors (R) Metallic...

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  11. (A) Orthorhombic crystal system has four Bravis lattices (R) Orthorhom...

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  12. (A) F- centre brings about colour (R) Vacancy with a trapped cation is...

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  13. (A) Zinc oxide is yellow coloured when hot (R) Zinc oxide has metal e...

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  14. (A) : Crystalline solids have sharp and chara cteric melting points. ...

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  15. (A) Diamond and graphite are polymorphic forms (R) Carbon adopts diffe...

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

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  17. (A) : In many crystal structures of ionic substances cations occupy th...

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  18. (A) Single crystals are formed when the process of crystallization is ...

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  19. (A): Crystalline solids are anisotropic (R): Crystalline solids are ...

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  20. (A) In any ionic solid with Schottky defects the number of positive an...

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