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NEET levelSingle correct optionDifficulty 1 of 3ss130

In the sodium chloride crystal, the coordination number of $Na X^{+}$ is

A4
B8
C6
D12

Answer: C

Cl X^{-}

forms a ccp lattice and

Na X^{+}

fills all octahedral voids, so each ion is surrounded by 6 ions of opposite charge (6:6 coordination).

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