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Which of the following defects, if prese...

Which of the following defects, if present, lowers the density of the crystal ?

A

Frenkel

B

Schottky

C

Edge dislocation

D

Constitution of F-centres.

Text Solution

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The correct Answer is:
B
Schottky defect is missing of equal no. of cations and Anions. This lowers the density.
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Any deviation from the perfectly ordered arrangement constitutes a defect or imperfection. The compounds in which the number of irregularity are present in the arrangement of atoms or ions are called atomic imperfections or point defects. These may be stochiometric or non - stoichlometric. Stoichiometric defects are further classified into Schottky defects in which number of positive and negative ions are missing in equal ratio and Frenkel defects in which an ion leaves its correct lattice sites and occupies on interstitial site. Schottky defect is more common in ionic compounds with high co-ordination number and where the size of positive and negative ions are almost equal, while in Frenkel defects are common in ionic compounds, which have low co-ordination number and in which there is large difference in size between positive and negative ions. Which of the following defect, if present, lowers the density of the crystal ?

Which of the following defects is present in KCl crystals ?

Which point defect lowers the density of a crystal?

Which of the following defects decrease the density ?

DINESH PUBLICATION-STATES OF MATTER (SOLID STATE CHEMISTRY)-ULTIMATE PREPARATORY PACKAGE
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  2. Which of the following is not a Bravais lattice ?

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  3. Which of the following is not a Bravais lattice ?

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  4. The unit cell that best describe the CsCl crystal lattice is

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  5. The thermal conductivity of graphite along an axis in the plane of hex...

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  6. At a temperature of absolute zero an intrinsic semiconductor is

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  7. The [111] plane is parallel to

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  8. The edge length of LiCl (NaCl structure) unit cell is 514 pm. Assumi...

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  9. A plane with intercepts 0.5a, 0.25b and 1.5c has the Miller indices

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  10. Graphite at room temperature is

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  11. Which of the following is a p-type semiconductor ?

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  12. Which of the following is an n-type semiconductor ?

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  13. In a gas lighter, mechanical energy is converted into electrical energ...

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  14. In Quartz watches, quartz is used

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  15. Quartz is

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  16. Which of the following is like copper in electrical conductivity and a...

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  17. Pick the odd one out

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  18. The intermetallic compound LiAg crystallizes in a cubic lattice in whi...

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  19. In sphalerite structure C.N. of cation and anion are respectively

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