For AX ionic crystal to exist in bcc structure, the ratio of radii ( r_ cation r_ anion ) should be [J & K CET 2008]

JEE Main Chemistry question

Not in JEE Main or NEET syllabus

For ionic crystal to exist in bcc structure, the ratio of radii should be [J & K CET 2008]

(A)Between 0.41 and 0.73
(B)Greater then 0.73Correct
(C)Less than 0.41
(D)Equal to 1.0

Answer: (B)

Solution

A bcc-type ionic lattice (as in CsCl) requires 8-fold coordination, which by the radius-ratio rule needs (up to the limiting value of 1.0 for identical radii). A ratio between 0.41 and 0.73 instead

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Question ID VK-141586