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

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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 a lined with those of the first layer.

answer is D.

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Detailed Solution

In hexagonal close packing, arrangement is AB AB..... . type and not ABC, ABC…… type.

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