A compound contains two types of atoms X and Y. It crystallises in a cubic lattice with atoms X at the corners of the unit cell and atoms Y at the body centre. The simplest possible formula of this compound is

X is present at the corner Each atom contributes 1 8 to the cube. Number of X atoms = 1 8 1 8 x Y is present at the body center There is only one cubic center, each atom contributes 1 to the cube. Number of Y atoms =1 The formulae of the lattice = XY Hence the correct answer is option (c)