Atoms of element y form hcp lattice and those of the
element x occupy 1
3 ⁄ of tetrahydral voids. What is the
formula of the compound formed by the elements x and y?
(A) X4Y3 (B) X3Y4 (C) X3Y2 (D) X2Y3
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Answer:
(C) X3Y2
Explanation:
HCP contains 6 atoms per unit cell.
Tetrahedral void = 2n (here n=6)
Tetrahedral void= 12
X = 6
Y = 12/3 = 4
Formula = X6Y4 or X3Y2
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