Answer: Option (d) is the correct answer.
Explanation:
Lattice energy is defined as the energy released when formation of 1 mole of an ionic compound occurs due to the combination of its constituent ions.
Hence, more is the magnitude of lattice energy more will be the stability of the ionic compound.
Also, lattice energy is represented by the expression.
where, = charge on cation
= charge on anion
r = distance between the cation and anion
Since, charge on the given species is the same. But lattice energy is inversely proportional to the distance. Hence, larger is the distance between the combining atoms lesser will be its lattice energy. And, when we move down a group there occurs an increase in the size of atoms of a group.
Therefore, given compounds are arranged according to increase in their lattice energy as follows.