MHT CET 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?

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

Answer: (B),(C)

Solution

(a) is true because a higher coordination number needs a larger ratio, and (d) is true for wurtzite; (b) is incorrect because a larger size difference lowers and so decreases the

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Question ID VK-042732