In a mixed oxide of A and B, A occupies all the octahedral voids while B occupies (2 / 3)^ rd the tetrahedral voids. The molecular formula of this oxide is

Step-by-step solution

According to mixed oxide, number of O ²⁻ ions =4 So, number of tetrahedral voids =8 and number of octahedral voids =4B occupies 2/3rd of tetrahedral void =8 2 3 =16 / 3A occupies all octahedral voids =4 Now, A: B: O 4: 16 3 : 4 12: 16: 12 3: 4: 3 (in simplest ratio) Hence, molecular formula of this oxide is A₃ B₄ O ₃ .