JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Which is not the correct statement for ionic solids in which positive and negative ions are held by strong electrostatic attractive forces? [DCE 2009]

(A)The radius ratio increases as coordination number increases
(B)As the difference in size of ions increases, coordination number increases
(C)When coordination number is eight, the ratio is between 0.225 to 0.414Correct
(D)In ionic solid of the type (ZnS, Wurtzite), the coordination number of and respectively are 4 and 4

Answer: (C)

Solution

By the radius ratio rule, the coordination number of an ionic crystal increases as increases — true for (A) and, in the sense intended here, for (B). The standard radius-ratio ranges are 0.225–0.414 for CN = 4, 0.414–0.732 for CN =

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Question ID VK-141568