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(A) The presence of a large number of Sc...

(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

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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AAKASH SERIES-SOLID STATE-OBJECTIVE EXERCISE -4
  1. (A) Space or crystal lattice differ in symmetry of the arrangement of ...

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  2. (A) In close packing of spheres a tetrahedral void is surrounded by fo...

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  3. (A) The presence of a large number of Schottky defects in NaCZ lowers ...

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  4. (A) Frenkel defects are found in silver halides (R) Frenkel defects a...

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  5. (A) Electrical conductivity of semiconductors increases with increasin...

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  6. (A) On heating ferromagnetic or ferrimagnetic substances, they become ...

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  7. (A) Insulators are generally good conductors (R) Insulators have free...

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  8. (A) Anti ferromagnetic substances posses zero magnetic moment. (R) MnO...

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  9. (A) Ionic solids conduct electricity in solid state. (R) Their conduct...

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  10. (A) Ionic solids are characterized by high melting and boiling point. ...

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  11. (A) Molecular solids are characterized by low melting point. (R) Molec...

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

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

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

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

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

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

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

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

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

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