Select the correct statement: (a) In closest packing of \( \mathrm{x} \) atoms, there are \( 2 \...

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Select the correct statement:
(a) In closest packing of \( \mathrm{x} \) atoms, there are \( 2 \mathrm{x} \) tetrahedral voids \& \( \mathrm{x} \) octahedral voids
(b) The co-ordination no. of \( \mathrm{U}: \mathrm{O} \) in \( \mathrm{UO}_{2} \) is \( 8: 4 \).
(c) In hexagonal packing of oxide ion sapphire (the aluminium oxide) \( \mathrm{Al}^{3+} \) ions crystallize in \( 2 / 3 \mathrm{rd} \) of the octahedral hole, then the formula of sapphire is \( \mathrm{Al}_{2} \mathrm{O}_{3} \).
(d) If anion \( \mathrm{B} \) constitutes \( \mathrm{CCP} \) and all the octahedral voids are occupied by cation \( (\mathrm{A}) \), the crystal has the same molecular formula \( A B \), if the cation \( (\mathrm{A}) \) occupies the alternate tetrahedral voids.
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