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Question

Three spheres of the first layer and three of the second layer enclose a site at the centre in a closest packing arrangement, this site is called:

A
interstitial void
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B
tetrahedral void
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C
octahedral void
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D
cubic coid
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Solution

The correct option is B octahedral void

The triangular voids in the first layer is overlapped by the triangular voids in the second layer.The interstitial void, formed by combination of two triangular voids of the first and second layer is called octahedral void because this is enclosed between six spheres centres of which occupy corners of a regular octahedron.

Hence option C is correct.


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