For the given close packed structure of a salt made of cation \( \mathrm{X} \) and anion \( \mat...

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For the given close packed structure of a salt made of cation \( \mathrm{X} \) and anion \( \mathrm{Y} \) shown below (ions of only one face are shown for clarity), the packing fraction is approximately \( \left(\right. \) Packing fraction \( \left.=\frac{\text { Packing efficiency }}{100}\right) \)
(a) 0.74
(b) 0.63
(c) 0.52
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