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JEE Main levelSingle correct optionDifficulty 2 of 3ss134

Sodium oxide has the antifluorite structure. The coordination numbers of $Na X^{+}$ and $O X^{2 -}$ are respectively

A8 and 4
B6 and 6
C4 and 8
D4 and 4

Answer: C

O X^{2 -}

forms the ccp lattice and

Na X^{+}

fills all 8 tetrahedral voids per cell, so each

Na X^{+}

has 4 oxide neighbours and each

O X^{2 -}

has 8 sodium neighbours.

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