# For an ionic crystal of the general formula $\mathrm{AX}$ and coordination number $6$, the value of radius ratio will be

1. A

Greater than 0. 73

2. B

In between 0.73 and 0.41

3. C

In between 0.41 and 0.22

4. D

Less than 0.22$\mathrm{NaCl}$

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### Solution:

The structural arrangement of co-ordination number '$6$' is octahedra1 and its radius ratio is $0.414-0.732$. The example of octahedral is $\mathrm{KCl}$ and $\mathrm{NaCl}$.

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