Question

a crystalline solid AB has NaCL type structure with the radius of B-ion is 250pm. which of the following cation can be made to slip into tetrahedral site of crystal of AB-

Answer 1

AB as Nacl type structure →FCC

Radius of B,RB=250pm

radius ratio⇒  R  B - R  A  +⇒R⇒R  A  + =0.414

=0.414×250

=103.5Pm