A compound is formed by cation C and anion A . The anions form hexagonal close packed (hcp) lattice and the cations occupy 75 % of octahedral voids. The formula of the compound is:

Step-by-step solution

In HCP lattice, effective number of atoms present in unit cell = 6 Thus, the number of anions per unit cell = 6 The number of octahedral voids is equal to the effective number of atoms in the unit cell. According to the question, cations are occupying 75 % of the octahedral voids, Thus, the number of cations per unit cell = 6 × 75 100 = 9 2 The formula of the ionic compound represents the simplest ratio of the ions present in it. The cation is written first and then the anion. Thus, the formula of the given co