If the distance between `Na^(+)` and `Cl^(-)` ions in NaCl crystals is 265 pm, then edge length of the unit cell will be ?
A. 265 pm
B. 530 pm
C. 795 pm
D. 132.5 pm
A. 265 pm
B. 530 pm
C. 795 pm
D. 132.5 pm
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Correct Answer – B
In NaCl :
Edge length `=2xx` distance between `Na^(+)` and `Cl^(-)` ions
`=2xx265=530` pm