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Question

Which of the following compounds has the minimum cation to anion size ratio?

A
CsF
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B
LiI
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C
LiF
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D
CsI
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Solution

The correct option is B LiI
The given anions are F and I and the size (R) order is RF<RI

The given cations are Li+ and Cs+ and the size (R) order is RLi<RCs

For the cation to anion ratio to be minimum, the compound must have a large anion and a small cation. Here, I is the largest anion and Li+ is the smallest cation.
Therefore, LiI has the minimum cation to anion size ratio.

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