For an ionic crystal of the general formula AX and coordination number 6, the value of radius ratio will be

A
Greater than 0. 73
B
In between 0.73 and 0.41
C
In between 0.41 and 0.22
D
Less than 0.22 $NaCl$

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 $KCl$ and $NaCl$ .

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