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Introduction to Imperfections in Solids

InA+B- ionic ...

Question

InA+B- ionic compound, radii ofA+andB- ions are 180pm and 187 pmrespectively. The crystal structure of this compound will be

NaCl type

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CsCl type

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ZnS type

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Similar to diamond

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Solution

The correct option is B
CsCl type

which lies in the range of 0.732-1.000, hence

co-ordination number = 8 i.e. the structure is CsCltype.

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