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JEE Main202118 Mar 2021Morning ShiftChemistrySolid StateActual

In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2 / 3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is:

Options

  1. AM 2   A 3
  2. BM 4   A 3
  3. CM 4   A
  4. DMA 3

Correct answer

B. M 4   A 3

Step-by-step solution

In HCP unit cell number of effective number of atoms is 6 , so A = 6 . Number of tetrahedral voids = 2 x number of atoms forming the lattice = 2   X   6 M 12 × 2 3   A 6 M 8   A 6 M 4   A 3

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