Statement I: In an FCC unit cell, packing efficiency is more when all tetrahedral voids are occupied — Solid State Chemistry Question
Question
Statement I: In an FCC unit cell, packing efficiency is more when all tetrahedral voids are occupied by the spheres of maximum possible size as compared with the packing efficiency when all octahedral voids are occupied in similar way. Statement II: Tetrahedral voids are more in number than octahedral voids in FCC.
Answer: D
💡 Solution & Explanation
Statement I is incorrect because the packing efficiency of FCC with all octahedral voids occupied by maximum possible size spheres is 79.2%, whereas with occupied tetrahedral voids it is 75.7%. Statement II is correct because an FCC unit cell contains 8 tetrahedral voids and 4 octahedral voids.
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