Which of the following is correct for the cry | vedclass

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(D) $ (a) $ $NaCl$ has an $fcc$ structure where the nearest neighbour distance is $\frac{a}{2}$. Thus, option $(a)$ is incorrect.$(b)$ In a $ccp$ unit

Vedclass · Accepted Answer

Nearest neighbour distance in $CsCl = a \frac{\sqrt{3}}{2}$

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(D) $ (a) $ $NaCl$ has an $fcc$ structure where the nearest neighbour distance is $\frac{a}{2}$. Thus, option $(a)$ is incorrect.$(b)$ In a $ccp$ unit cell, the edge length $a = 2 \sqrt{2} r$. Therefore, the volume $a^3 = (2 \sqrt{2} r)^3$. Thus, option $(b)$ is incorrect.$(c)$ The packing fraction of a $bcc$ unit cell is $68 \%$, while that of an $fcc$ unit cell is $74 \%$. Thus, $fcc$ is more efficient than $bcc$. Option $(c)$ is incorrect.$(d)$ $CsCl$ crystallizes in a $bcc$ type structure. In a $bcc$ lattice, the nearest neighbour distance is $\frac{a \sqrt{3}}{2}$. Thus, option $(d)$ is correct.

Which of the following is correct for the crystal lattices mentioned below?

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