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Question

The number of tetrahedral voids present on each body diagonal in CCP unit cell is:

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is C 2
In ccp, number of atoms present per unit cell =4
Since in cubic closed packing, the number of tetrahedral voids is equal to twice the number of atoms present per unit cell, hence
Number of tetrahedral voids=2×4=8
These voids are uniformly distributed over each of the 4 body diagonals. Therefore,
Number of tetrahedral voids present on each body diagonal in CCP unit cell =84=2

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