Which of the the following structure is not correctly matched?

N a C l

type-

C l^{-}

ions in

c c p

structure.

N a^{+}

ions in half octahedral holes.

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Z n S

type-

S^{2 -}

ions in

c c p

structure.

Z n^{2 +}

ions in alternate tetrahedral voids.

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C a F_{2}

type-

c c p

structure.

F^{-}

ions in all tetrahedral voids.

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N a_{2} O

type-

c c p

structure.

N a^{+}

ions in all tetrahedral holes.

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Solution

The correct option is A $N a C l$ type- $C l^{-}$ ions in $c c p$ structure.
$N a^{+}$ ions in half octahedral holes.
In $N a C l$ , chloride ions are ccp type of arrangement, i.e., it contains chloride ions at the corners and at the centre of each face of the cube.
Sodium ions are so located that there are six chloride ions around it. This equivalent to saying that sodium ions occupy all the octahedral sites.

So, option A is not correctly matched.

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Similar questions

In fluorite structure (CaF₂)

In a normal spinel type structure, the oxide ions are arranged in ccp whereas $\frac{1}{8}$ tetrahedral holes are occupied by $Z n^{2 +}$ ions and 50% of octahedral holes are occupied by $F e^{3 +}$ ions. The formula of the compound is ?

Q. The tetrahedral voids formed by ccp arrangement of

C l^{-}

ions in rock salt structure are:

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

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