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In the distance between Na^(+) and CI^(-...

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

Text Solution

Verified by Experts

The correct Answer is:
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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