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A compound of formula A 2 B 3 has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms :

1. hcp lattice – A, 3 1 Tetrahedral voids-B
2. hcp lattice - B, 3 1 Tetrahedral voids -A
3. hcp lattice - A, 3 2 Tetrahedral voids -B
4. hcp lattice -B, 3 2 Tetrahedral voids-A

Correct answer: hcp lattice - B, 3 1 Tetrahedral voids -A

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