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Q.

In a hexagonal closest packing in two layers one above the other, the coordination number of each sphere will be

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a

8

b

6

c

9

d

4

answer is B.

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Detailed Solution

In hexagonal closest packing, each atom is in contact with 6 atoms above and 6 atoms below it in a unit cell. Thus, coordination number per atom is going to be 12 and 6 for single unit cell.

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