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  • Answer the following : (a) What is the formula of a compound in which element Y forms ccp lattice and atoms X occupy  <img alt="\frac{1}{3}^{rd}" src="https://entrancecorner.codecogs.com/gif.latex?%5Cfrac%7B1%7D%7B3%7D%5E%7Brd%7D" /

Answer the following :

(a) What is the formula of a compound in which element Y forms ccp lattice and atoms X occupy  \frac{1}{3}^{rd} of tetrahedral voids ?

(b) What type of non-stoichiometric point defect leads to colour in alkali metal halides ?

 

 

 

 
 
 
 
 

Answers (1)

(a) No. of atoms of Y in ccp = 4

No. of tetrahedral voids =2\times 4=8

No. of voids occupied by X =\frac{1}{3}\times 8=\frac{8}{3}

Ratio of atoms X and Y =\frac{8}{3}:4=2:3

Formula of compound =X_2Y_3

(b) Metal excess defect due to anionic vacancies which is a non - stoichiometric defect results in colour in alkali metal halide.

Posted by

Sumit Saini

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