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Select the correct statements:-$\begin{array}{1 1}(A)\;\text{ For CsCl unit cell (edge-length = a), }r_c + r_a =\large\frac{\sqrt 3a}{2}\\(B)\;\text{ For NaCl unit cell (edge-length = l), }r_c + r_a =\large\frac{1}{2}\\(C)\;\text{ The void space in a b.c.c unit cell is 0.68}\\(D)\;\text{The void space % in a face-centered unit cell is 26%}\end{array}$

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All of these
Hence (D) is the correct answer.
answered May 30, 2014 by sreemathi.v

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