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-
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AB as Nacl type structure →FCC
Radius of B,RB=250pm
radius ratio ⇒ R B − R A + ⇒R A +
=0.414
=0.414×250
=103.5Pm
P + ,R + and S +
have greater radius then 103.5pm
these are not able to slip.
only Q +
(R=56pm) can made to slip into tetrahedral
site.
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