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Question

Assertion :Packing fraction of FCC and HCP unit cells are same. Reason: Both fcc and hcp unit cells have same packing pattern i.e. ABCABCABC.......

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is C Assertion is correct but Reason is incorrect

A unit cell is the smallest representation of an entire crystal. ... The hexagonal closest packed (hcp) has a coordination number of 12 and contains 6 atoms per unit cell. The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell.Both fcc and hcp unit cells does not have same packing pattern.


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