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Which type of defect’ has the presence o...

Which type of `defect’ has the presence of cations in the interstitial sites?

A

Frenkel defect

B

Metal deficiency defect

C

Schottky defect

D

Vacancy defect

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The correct Answer is:
A
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Assertion (A) : Non-stoichiometric compounds are called Bertholide compounds. NaCl and KCl crystal, when heated in an atmosphere of Na and K varpours, respectively, they impart violet and yellow colours to NaCl and KCl , respectively. Reason (R ) : Metal excess defect is due to the presence of extra cations atg the interstitial sites. The excess metal ions move to the interstitial sites and the electrons to the neighbouring sites. The colour results byt the excitation of these electrons by absorbing suitable energy from visible light. When the excited electroon comes back to the ground state, there is emission of radiation in the visible region and gives complimentary colour.

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RESONANCE ENGLISH-SOLID STATE-Exercise -3 (Part-II)
  1. Na and Mg crystallize in bcc- and fcc-type crystals, respectively, the...

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  2. How many unit cells are present in a cubic shaped ideal crystal of NaC...

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  3. What type of crystal defect is shown in the figure given below ? {:(...

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  4. A ionic compound has a unit cell consisting of a ions at the corners o...

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  5. Total volume of atoms present in a fcc unit cell of a metal with radiu...

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  6. In a compound, atoms of the element Y form ccp lattice and those of th...

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  7. Copper crystallises in fcc with a unit cell length of 361 pm. The radi...

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  8. The edge length of a face-centred cubic unit cell is 508 p m. If the r...

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  9. Percentage of free space in cubic close packed structure and in body c...

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  10. In a face centred cubic lattice, atom A occupies the corner positions ...

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  11. Copper crystallises in fcc with a unit cell length of 361 pm. The radi...

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  12. Lithium forms body centred cubic structure. The length of the side of ...

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  13. Experimentally it was found that a metal oxide has formula M(0.098)O. ...

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  14. CsCl crystallises in body centred cubic lattice. If 'a' is its edge le...

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  15. Sodium metal crystallizes in a body centered cubic lattice with the ce...

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  16. Which of the following compounds is metallic and ferromagnetic ?

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  17. A metal crystallises in a face centred cubic structure. If the edge le...

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  18. Which type of defect’ has the presence of cations in the interstitial ...

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