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In which of the following structures coordination number for cations and anions in the packed structure will be same?
(a) \( \mathrm{Cl}^{-} \)ion form \( f c c \) lattice and \( \mathrm{Na}^{+} \)ions occupy all octahedral voids of the unit cell.
(b) \( \mathrm{Ca}^{2+} \) ions form \( f c c \) lattice and \( \mathrm{F}^{-} \)ions occupy all the eight tetrahedral voids of the unit cell.
(c) \( \mathrm{O}^{2-} \) ions form \( f c c \) lattice and \( \mathrm{Na}^{+} \)ions occupy all the eight tetrahedral voids of the unit cell.
(d) \( \mathrm{S}^{2-} \) ions form \( f c c \) lattice and \( \mathrm{Zn}^{2+} \) ions go into alternate tetrahedral voids of the unit cell.
\( \mathrm{P} \)
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