Solid State Question 92
Question: When heated above $ 916{}^\circ C, $ iron changes its bcc crystalline form to fcc without the change in the radius of atom. The ratio of the density of the crystal before heating and after heating is:
Options:
A) 1.069
B) 0.918
C) 0.725
D) 1.231
Show Answer
Answer:
Correct Answer: B
Solution:
[b] $ {\rho_1}=\frac{2\times 56}{{{( 4r/\sqrt{3} )}^{3}}};{\rho_2}=\frac{4\times 56}{{{( 2\sqrt{2r} )}^{3}}} $
$ \frac{{\rho_1}}{{\rho_2}}=0.918 $
BETA
