Solve this:
Q.26. Salt AB has a zinc blende structure. The radius of ions are 0.7 Å and 1.8 Å respectively. The edge length of AB unit cell is
(1) 2.5 Å
(2) 5.09 Å
(3) 5 Å
(4) 5.77 Å
I am an aakashian. And this question was asked in nodal test. I showed it to my faculty. No option is matching. Option is wrong. Correct answer is as foll
√3a=2r(cation)+2r(anion). Put the value to get the answer. Answer is approximately 2.88 angstroms.