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Question

A salt MY crystallizes in the CsCl structure. The anions at the coners touch each other and cation is at the centre. The radius ratio, rr for this structure is :

A
0.225
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B
0.414
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C
0.732
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D
1.0
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Solution

The correct option is D 0.732
Limitting radius
ratio =r/R
Coordination
Number of cation
Structural
Arrangement
(Geometry of voids)
Example
0.1550.225 3 Plane Trigonal Boron Oxide
0.2250.414 4 Tetrahedral ZnS,SiO2
0.4140.732 4 Square planer
0.4140.732 6 Octahedral NaCl,MgO2
0.7321.000 8 Cubic CaCl

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