In diamond the lattice is fcc with C atoms occupying lattice points as well as some of the voids. Which of the following statements (s) is/are correct about the diamond structure?
I In the diamond lattice, half of the tetrahedral voids are occupies.
II Percentage space occupied (packing efficiency) is 74%
III In the diamond lattice, all octahedral voids are occupied

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I , II and III

Only II

Only III

Only I

answer is A.

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I	In the diamond lattice, half of the tetrahedral voids are occupies.
II	Percentage space occupied (packing efficiency) is 74%
III	In the diamond lattice, all octahedral voids are occupied