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In the material, spinel, having the formula MgAl2O4, oxide ions are arranged in the cubic close packing, Mg$^{2+}$ ions occupy the tetrahedral voids while $Al^{3+}$ ions occupy the octahedral voids.(ii) What percentage of octahedral voids is occupied by $Al^{3+}$ ions?

1 Answer

Hence (B) is the correct answer.
answered May 29, 2014 by sreemathi.v