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In a face centered cubic lattice atoms A are at the corner points and atoms B at the face centered points. If atom B is missing from one of the face centered points, the formula of the ionic compound is :

Options

  1. AA 2 B 3
  2. BAB 2
  3. CA 5 B 2
  4. DA 2 B 5

Correct answer

D. A 2 B 5

Step-by-step solution

A atoms at corners = 8 × 1 8 =  A (one atom) B atom is missing at One face centre then will present at 5 faces At face centre atom contribute 1/2 part Number of B atom at Face centre = 5 × 1 2 (B atom) So formula of compound = A 2 B 5

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