A binary solid `A^+B^-` has zinc blende structure with B ions constituting the lattice corner & face center of unit cell and `A^(-)` ion occupying 25% tetrahedral holes. Find the formula of the compound.

A compound is formed by two types of ions viz. A (as cation) & B (as anion). B ions make ccp and A ions occupy the all the tetrahedral voids. Write the formula of the compound.

In a face centred cubic arrangement of A and B atoms whose A atoms are at the corner of the unit cell and B atoms are at the face centres. One of the A atom is missing from one corner in the unit cell. What will be the result our formula of the compound formed?