In a face centered cubic unit cell, the ratio of number of alternate tetrahedra voids to the lattice points is. A)7:2 B)7:4 C)4:7 D)2:7 give explanation also?

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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

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

List-I (Solids)	List-II (Unit cell)	List-III (Coordination number)
(a) Rock salt	(p) Face-centred cubic, anion in tetrahedral void	(w) 6
(b) Fluorite	(q) Face-centred cubic, cation in octahedral void	(x) Cation (8), anion (4)
(c) Agl, ZnS	(r) Face-centred cubic, cation in alternate tetrahedral void	(y) Cation (4), anion (8)
(d) $N a_{2} O$	(s) Face-centred cubic, cation in tetrahedral void	(z) Cation (4), anion (4)

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