The general formula of an ionic compound crystallizing in antifluorite structure is

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${AB}_{3}$

${AB}_{2}$

$A_{2} B$

answer is C.

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Detailed Solution

The general formula of an ionic compound crystallizing in antifluorite structure is $A_{2} B$ .

Cations and anions are arranged in the anti-fluorite structure in the opposite direction from the fluorite structure.

The structure of ${Na}_{2} O$ is an antifluorite. I The $O^{- 2}$ ions form a cubic close-packed lattice (fcc structure) in the crystal structure of ${Na}_{2} O$ , while the ${Na}^{+}$ ions fill all of the tetrahedral spaces.

(ii) There are 8 ${Na}^{+}$ ions in contact with each oxide ion, $O^{- 2}$ ion, and 4 oxide ions with each ${Na}^{+}$ ion. ${Na}_{2} O$ has 4:8 coordination as a result.

${Na}_{2} S$ are example.

Hence the option C is correct.

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