Question

In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is:

(A) AB₂ 

(B) A₂B₃ 

(C) A₂ B₅ 

(D) A₂ B

Answer 1

Correct option A₂B₅

Explanation:

 Effective no. of A atoms = 1/8 x 8 = 1

Effective no. of B atoms = 1/2 x 5  (One is missing) = 5/2

Therefore formula is A₁B_5/2 = A₂B₅