The Solid State - Result Question 19
####19. $A B$ crystallizes in a body centred cubic lattice with edge length ’ $a$ ’ equal to $387 pm$. The distance between two oppositely charged ions in the lattice is :
[2010]
(a) $335 pm$
(b) $250 pm$
(c) $200 pm$
(d) $300 pm$
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Solution:
- (a) For bcc lattice, diagonal $=a \sqrt{3}$.
The distance between the two oppositely charged ions $=\frac{a}{2} \sqrt{3}$
$=\frac{387 \times 1.732}{2} \simeq 335 pm$
