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Number of NaCl ion pairs present in 1 unit cell of sodium chloride is

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answer is C.

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Detailed Solution

The chloride ions in NaCl are arranged in FCC.

So, cell content of chloride ions = 4.

Sodium ions occupy the octahedral voids (i.e at body center and edge center).

Na⁺=12×1/4+1=4

So, each unit cell contains 4 pairs of NaCl.

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