In a cubic closest packed structure of mixed oxides, the lattice is made up of oxide ions. Tetra...

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In a cubic closest packed structure of mixed oxides, the lattice is made up of oxide ions. Tetrahedral voids are occupied by divalent \( \mathrm{X}^{2+} \) ions and octahedral voids are occupied by trivalent \( \mathrm{Y}^{3+} \) ions. If only \( 50 \% \) of the octahedral voids are occupied, then the percentage of tetrahedral voids occupied is
(a) \( 50 \% \)
(b) \( 12.5 \% \)
(c) \( 25 \% \)
(d) \( 40 \% \)
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