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Question

The HCP and CCP structure for a given element would be expected to have:

A
the same co-ordination number.
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B
the same density.
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C
the same packing fraction.
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D
all the above.
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Solution

The correct options are
A the same co-ordination number.
C the same packing fraction.
The HCP and CCP structure has the same co-ordination number (12) and the same packing fraction (0.74) but different density as no of atoms as well as volume of cells is different.

Hence, the correct options are A4 and C

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