Which one of the following statements about packing in solids is incorrect?

  • A
    Coordination number in $bcc$ mode of packing is $8$.
  • B
    Coordination number in $hcp$ mode of packing is $12$.
  • C
    Void space in $hcp$ mode of packing is $32\%$.
  • D
    Void space in $ccp$ mode of packing is $26\%$.

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$A$ solid compound is formed by atoms of $A$ (cations),$B$ (cations),and $O$ (anions). Atoms of $O$ form an $hcp$ lattice. Atoms of $A$ occupy $25\%$ of the tetrahedral voids,and atoms of $B$ occupy $50\%$ of the octahedral voids. What is the molecular formula of the solid?

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