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A solid `AB` has `NaCl` structure. If the radius of the cation `A` is `100` pm, what is the radius of anion `B`?
A. 241.54 pm
B. 136.61 pm
C. 120.7 pm
D. 68.3 pm

1 Answer

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Correct Answer - A
NaCl has coordination number of 6. Thus, radius ratio of AB will be between 0.414 and 0.732 . For maximum radius.
`(r_(+))/(r_(-))=0.414`
`(100)/(r_(-))=0.414`
`r_(-)=241.54` pm

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