Which of the following is not true about the ionic solids ?

(a) Bigger ions form the close packed structure

(b) Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size

(c) Occupation of all the voids is not necessary

(d) The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids

Q. A compound with formula $A{B}_2{O}_4$ adopts a crystal structure in which $O^{2-}$ ions forms ccp arrangement. $A^{2+}$ ions occupy octahedral voids while $B^{3+}$ ions are distributed equally between tetrahedral and octahedral voids. The fraction of octahedral and tetrahedral voids occupied respectively are:

Q. A compound with formula $A{B}_2{O}_4$ adopts a crystal structure in which $O^{2-}$ ions forms ccp arrangement. $A^{2+}$ ions occupy octahedral voids while $B^{3+}$ ions are distributed equally between tetrahedral and octahedral voids. The fraction of octahedral and tetrahedral voids occupied respectively are:

Q.

In which of the following structures coordination number for cations and anions in the packed structure will be same ?

(a) $C{l}^{-}$ ions form fcc lattice and $N{a}^{+}$ ions occupy all octahedral voids of the unit cell

(b) $C{a}^{2+}$ ions form fcc lattice and $F^{-}$ ions occupy all the eight tetrahedral voids of the unit cell

(c) $O^{2-}$ ions form fcc lattice and $N{a}^{+}$ ions occupy all the eight tetrahedral voids of

(d) $S^{2-}$ ions form fcc lattice and $Z{n}^{2+}$ ions go into alternate tetrahedral voids of the unit cell

Q. In an oxide, oxide ions are packed in an FCC unit cell in which $B^{3+}$ ions occupy x% of octahedral voids and $A^{2+}$ ions occupy y% of tetrahedral voids, then which of the following is/are correct about the unit cell?

Q. A mineral consists of a cubic close-packed structure formed by $O^{2-}$ ions where half the octahedral voids are occupied by $A{l}^{3+}$ and one-eighth of the tetrahedral voids are occupied by $M{n}^{2+}$. The chemical formula of the mineral is: