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Ionic Compounds and Radius Ratios

An ionic comp...

Question

An ionic compound AB has fluorite type structures. if the radius of B^- is 200pm then the radius of A⁺ would be
82.8pm

146.4pm

40 pm

45 pm

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Solution

Fluorite type structure is FCC lattice having radius of cation to anion ratio = 0.414
Since anion is 200 pm, the cation would be 0.414 $\times$ 200 = 82.8 pm.
Answer is (a).

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