JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Which set of characteristics of ZnS crystal is correct? [AMU 2009]

(A)Coordination number (4 : 4): ccp; ion in the alternate tetrahedral voidsCorrect
(B)Coordination number (6 : 6): hcp; ion in all tetrahedral voids
(C)Coordination number (6 : 6): hcp; ion in all octahedral voids
(D)Coordination number (4 : 4): ccp; ion in all tetrahedral voids

Answer: (A)

Solution

In zinc blende (ZnS), the ions form a cubic close-packed (ccp/fcc) arrangement, and since there are twice as many tetrahedral voids as anions, only half (alternate) of the tetrahedral voids can be occupied by to

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Question ID VK-141549