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A body centre cubic lattice is made up of two different types of atoms A and B . Atom A occupies the body centre and B occupying the corner positions. One of the corners is left unoccupied per unit cell. Empirical formula of such a solid is

Options

  1. AAB
  2. BA 2 B 2
  3. CA 5 B 7
  4. DA 8 B 7

Correct answer

D. A 8 B 7

Step-by-step solution

There is one A per unit cell Number of B per unit cell = 1 8 × 7 = 7 8 Empirical formula = A 1 B 7 8 =   A 8 B 7

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