The no. Of tetrahedral and octahedral voids formed with a 1 half of sphere with adjacent layers of close packing are respectively

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Q. How many tetrahedral and octahedral void spaces are three for each sphere in close packing?

Q. Assertion :A tetrahedral void is surrounded by four spheres and an octahedral void is surrounded by six spheres. Reason: The number of tetrahedral voids is double the number of close packed spheres and number of octahedral voids is equal to number of close packed spheres.

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Which of the following is not true about the voids formed in 3 dimensional hexagonal close packed structure ?

(a) A tetrehedral void is formed when a sphere of the second layer is present above triangular void in the first layer

(b) All the triangular voids are not covered by the spheres of the second layer

(c) Tetrahedral voids are formed when the triangular voids in the second layer lie above the triangular voids in the first layer and the triangulare shapes of these voids do not overlap

(d) Octahedral voids are formed when the triagular voids in th second layer exactly overlap with similar voids in the first layer

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