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KVPY2019ChemistrySolid State

Atoms of an element Z form hexagonal closed packed hcp lattice and atoms of element X occupy all the tetrahedral voids. The formula of the compound is

Options

  1. AXZ
  2. BXZ 2
  3. CX 2 Z
  4. DX 4 Z 3

Correct answer

C. X 2 Z

Step-by-step solution

Number of lattice points in a hcp lattice : number of tetrahedral voids is in 1 : 2 ratio. ∴ Number of Z atoms : X atoms = 1 : 2 ∴ Formula of compound = X 2 Z

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