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Question

A solid crystal is composed of X, Y and Z atoms. Z atoms (radius 200 pm) form cubic closed packed structure where as X (radius 50 pm) and Y (radius 100 pm) occupy respective voids. Assume all the voids are occupied.
Which type of voids are occupied by ‘x’ atoms:

A
Tetrahedral
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B
Octahedral
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C
Cubic
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D
All of these
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Solution

The correct option is A Tetrahedral

A solid crystal is composed of X, Y and Z atoms. Z atoms (radius 200 pm) form cubic closed packed structure where as X (radius 50 pm) and Y (radius 100 pm) occupy respective voids. Assume all the voids are occupied.
rxrz=50200=0.25
Which is in b/w 0.225 – 0.414
‘X’ atoms are in tetrahedral voids


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