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Question

Pick out the incorrect statement about CsCl structure.

A
CsCl has a bcc structure
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B
Cl ions are present at cubic centres
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C
Coordination no. of both Cs+ and Cl is 8
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D
Cl adopts a simple cubic lattice
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Solution

The correct option is B Cl ions are present at cubic centres
CsCl crystallizes in a body centred cubic structure where Cl ions forms a simple cubic structure with Cs+ ion occupying the body centre.
This type of structure is formed when the anion and cation have similar sizes.

Cs+ ion at the centre is surrounded by 8 Cl ions in the corners of the cube. Thus, the coordination number of Cs+ ion is 8.
Each Cl ion at the corner is shared by 8 Cs+ from eight unit cells. Thus, the coordination number of Cl is 8


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