Which of the following have their radius ratio not in this range of $0.414 - 0.732$ (NaCl type) structure but still possess NaCl type structure?

LiBr

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KCl

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RbCl

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BaO

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Solution

The correct options are
A LiBr
B KCl
C RbCl
D BaO
For NaCI, the radius ratio is in the range of $0.414 - 0.732$ .
However, the radius ratio for LiBr, KCI, RbCI, and BaO are $0.34, 0.38, 0.77$ and $0.83$ respectively which are not in the range of $0.414 - 0.732$ but they still possess NaCl type structure. These all are examples of rock salt.

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