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In the distance between `Na^(+)` and `CI^(-)` ions in sodium chliride crystal is X pm , the length of the edge of the unit cell is

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In the distance between `Na^(+)` and `CI^(-)` ions in sodium chliride crystal is X pm , the length of the edge of the unit cell is
A. 4X pm
B. X/4 pm
C. X/2 pm
D. 2X pm
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Correct Answer - D
In NaCl , the length of the edge of the unit cell
= 2 x distance between `Na^+ " and " Cl^-` ions
Hence , a=2X pm.
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