An $A B_{2}$ type structure is found in

$N a C l$

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$A l_{2} O_{3}$

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$C a F_{2}$

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$N_{2} O$

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Solution

The correct option is C
$C a F_{2}$

$\Rightarrow A B_{2}$ type structure (fluorite type)
$\Rightarrow C a F_{2} \Rightarrow C a^{2 +}$ forms ccp arrangement.
$\Rightarrow$ It covers corners and face centres.
$\Rightarrow F^{-}$ ions are located such that $4 C a^{2 +}$ ions are around it.
It can be said that they occupy tetrahedral sites.

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