1.

Which of the following statements is not true about the hexagonal close packing ?

Answer»

The coordination NUMBER is 12
It has 74% packing efficiency
Tetrahedral voids of the second layer are covered by the SPHERES of the third layer
In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer

Solution :In HCP close packing, the spheres of the third layer are exactly aligned with the spheres of the first layer.


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