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Standard XII

Chemistry

Close Packing

In octahedral...

Question

In octahedral holes (voids)

A bi-triangular void surrounded by four spheres

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A bi-triangular void surrounded by six spheres

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A simple triangular void surrounded by four spheres

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A bi-triangular void surrounded by eight spheres

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Solution

The correct option is B A bi-triangular void surrounded by six spheres
Tetrahedral void is a simple triangular void in a crystal and is surrounded by four spheres arranged tetrahedrally around it. On the other hand, an octahedral void is a double triangular void with one triangle vertex upwards and the other triangle vertex downwards and is surrounded by six spheres.

Hence B is correct option

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Similar questions

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.

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

Q. There are three cubic unit cells

A, B

and

C

A

F C C

and all of its tetrahedral voids are also occupied.

B

is also

F C C

and all of its octahedral voids are also occupied.

C

is simple cubic and all of its cubic voids are also occupied. If voids in all unit cells are occupied by the spheres exactly at their limiting radius, the order of packing efficiency would be:

Q. In zinc sulphide, ZnS, the radius ratio is 0.40. Each zinc ion is tetrahedrally surrounded by four

S^{- 2}

ions and each

S^{- 2}

ion is surrounded by four

Z n^{+ 2}

ions.
Which void would be occupied by

Z n^{+ 2}

ions?

Q. Radius of an octahedral void relative to the radius of the spheres in a close packing is:

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