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Molecular Structure type

The ionic radii of Rb+ and I- respectively are 1.46 Å and 2.16Å. The very most probable type of structure exhibited by it is: (a) CsCl type  (b) ZnS type  (c) Nacl type  (d) CaF2 type

Answer: (c) (rC+)/(ra-) = 1.46/2.16 = 0.676
It permits co-ordination number 6 and octahedral structure of type Nacl.

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