1) An ionic compound has a unit cell consisting of A ions at the corners of a cube and b ions on the centres of the faces of the cube. The empirical formula for this compound would be A) $A_{3}B$ B) $AB_{3}$ C) $A_{2}B$ D) AB Answer: Option BExplanation: Number of A ions in the unit cell = $\frac{1}{8}\times8=1$ Number of B ions in the unit cell = $\frac{1}{2}\times6=3$ Hence empirical formula of the compound = AB3
