Which of the following $F C C$ structure contains cations in alternate tetrahedral voids?

N a C l

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Z n S

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N a_{2} O

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C a F_{2}

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Solution

The correct option is D $Z n S$
In Zinc Blende (ZnS) structure, $S^{- 2}$ are in ccp sites and $Z n^{+ 2}$ are in alternate tetrahedral voids.
Other examples of zinc Blende structure are $C u B r, C u C l, C u I, A g I, B e S$ .

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Similar questions

Z n^{2 +}

F^{-}

C a F_{2}

Z n^{2 +}

C a F_{2}, F^{-}

Which of the following are TRUE for $Z n S$ type and $C a F_{2}$ type structure?

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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