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Grade 12th passDiscuss with colleagues and IITians

CHAPTER: SOLID STATEQ. when heated above 916 degree celcius iron changes its crystal structure from bcc to ccp without any change in radius of the atom.the ratio of density if crystal before heating and after heating is:A)1.089B)0.918C)725D)1.231

Profile image of Krishna singh
9 Years agoGrade 12th pass
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1 Answer

Profile image of Arun
6 Years ago
The ratio of density of the crystal before heating and after heating is
d 
2
​ 
 
d 
1
​ 
 
​ 
 = 
V 
2
​ 
 N 
0
​ 
 
z 
2
​ 
 M
​ 
 
V 
1
​ 
 N 
0
​ 
 
z 
1
​ 
 M
​ 
 
​ 
 = 
V 
2
​ 
 
z 
2
​ 
 
​ 
 
V 
1
​ 
 
z 
1
​ 
 
​ 
 
​ 
 = 
(2 
2
​ 
 ) 
3
 
4
​ 
 
(4r/ 
3
​ 
 ) 
3
 
2
​ 
 
​ 
 =0.918

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