JEE Main Chemistry question

Not in JEE Main or NEET syllabus

In a cubic close packing of spheres in three dimensions, the co-ordination number of each sphere is:

(A)6
(B)9
(C)3
(D)12Correct

Answer: (D)

Solution

In cubic close packing (ccp/fcc, as in hcp), each sphere touches 12 nearest neighbours: 6 in its own layer, 3 in the layer above and 3 in the layer below. This is higher than the coordination

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Question ID VK-141686