Multiple choice

If the distance between Na+ and Cl- ions in face centred cubic NaCl crystal is 265 pm, then what will be the apparent radius of NaCl crystal?

  1. 125.5 pm

  2. 128.3 pm

  3. 160.6 pm

  4. 187.35 pm

  5. 530 pm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Edge length of the NaCl crystal = 2 x distance between Na+ and Cl- ions = 2 x 265 = 530 pm Now, for face centred cubic unit cell, a√2 = 4r r = a√2 / 4 = 530 x 1.414/4 = 187.35 pm. Hence, the apparent radius of NaCl crystal is 187.35 pm.

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