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Question

A solid AB has NaCl structure. If the radius of cation A is 160 pm, the maximum possible radius of the anion B will be (in pm):

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Solution

Co-ordination number of NaCl is 6.
According to radius ratio rule, If the co-ordination number is 6, then
rcra ratio is between 0.4140.632.
Given, rc=160 pm
To get maximun possible radius for anion,
rcra=0.414
ra=rc0.414=1600.414=386.4 pm

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