The radius ratio ( r_+ r_- ) of an ionic solid (A^+B^-) is 0.69. What is the coordination number of B^-?

JEE Main Chemistry question

Not in JEE Main or NEET syllabus

The radius ratio of an ionic solid is 0.69. What is the coordination number of ?

(A)6Correct
(B)8
(C)4
(D)9

Answer: (A)

Solution

A radius ratio of 0.69 lies within the range 0.414–0.732, which corresponds to octahedral (6-coordinate) packing — just short of the 0.732 threshold needed for 8-coordination. Since in a

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Question ID VK-141594