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Coordination Number

In which of t...

Question

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

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Solution

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

$N a C l$ crystal has rock salt structure having fcc lattice in which $C l^{-}$ ions are present at fcc lattice points and face centre and $N a^{+}$ occupies all the octahedral void of given unit cell.

Where. Coordination number of $N a^{+} = 6$

Coordination number of $C l^{-} = 6$

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