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Question

The co-ordination number of cation and anion in CaF2 and CsCl are respectively.

A
8:4 and 6:3
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B
6:3 and 4:4
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C
8:4 and 8:8
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D
4:2 and 2:4
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Solution

The correct option is A 8:4 and 6:3
The co-ordination number of cation and anion in CaF2 and CsCl are 8:4 and 8:8 respectively.
In CaF2 unit cell, Ca2+ ions form fcc unit cell and F ions are present in tetrahedral voids. Each Ca2+ ion is surrounded by 8 F ions. Each F ion is surrounded by 4 Ca2+ ions.
In CsCl unit cell, Cl ions are present at corners of cube and Cs+ ions are present at body center which is a cubic void. Each Cl ion is surrounded by 8 Na+ ions.
Each Na+ ion is surrounded by 8 Cl ions.

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