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1. The Solid State
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Q23 of 68 Page 30

Explain the following terms with suitable examples:

F-centres.

This is a type of defect and is also called as the metal access defect. These type of defects are seen because of missing of anions from regular site leaving a hole which is occupied by electron to maintain the neutrality of the compound. Hole occupied by electron is called F – centre and is responsible for showing colour by the compound.


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23

Explain the following terms with suitable examples:

Frenkel defect

23

Explain the following terms with suitable examples:

Interstitials

24

Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.

(i) What is the length of the side of the unit cell?


(ii) How many unit cells are there in 1.00 cm3 of aluminium?

25

If NaCl is doped with 10–3 mol % of SrCl2, what is the concentration of cation vacancies?

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1. The Solid State
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