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Q.26. Salt AB has a zinc blende structure. The radius of A 2 +   a n d   B 2 - 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.
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root(3) /4 a= 0.7+1.8 

a=5.77

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