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(A): Thermodynamically all solids posses...

(A): Thermodynamically all solids possess a tendency to acquire defects
(R) : During defects the entropy of the system increases in solids. 

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): Thermodynamically all solids possess a tendency to acquire defect...

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  2. (A) Schottky and Frenkel defects are also called thermodynamic defects...

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  3. Assertion (A): White tin is an example of tetragonal system. Reasoning...

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  4. (A): A void surrounded by a triangle of spheres capped by another sphe...

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  5. (A) : With increase in temperature the condicutivity of metals decreas...

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  6. (A): Antiferromagnetic substances possess almost zero magnetic moment ...

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  7. A : K(4)[Fe(CN(6))] is diamagnetic R: The alignments of magnetic di...

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  8. (A): Fe(3)O(4) is ferrimagnetic at room temperature but becomes parama...

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  9. (A): ABAB ..... pattern of close packing gives hcp arrangement (R): ...

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  10. (A) Schottky type defect is shown by crystals with high coordination n...

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  11. (A) Crystals exhibiting Frenkel type defects do not show any change in...

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  12. (A) Glass is an amorphous solid (R) Glass has an irregular, random arr...

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  13. (A) Diamond and graphite do not have same crystal structure. (R) Diamo...

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  14. (A) Space or crystal lattice differ in symmetry of the arrangement of ...

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

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

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

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

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

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

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