The ionic bonds X+Y- are formed when :(I) electron affinity of Y is high (II) ionization energy of X is low(III) lattice energy of XY is high (IV) lattice energy of XY is lowChoose the correct code :

The ionic bonds X+Y- are formed when-(I) Metal forming cation (X+) should have low ionisation energy.(II) Non-metal forming anion (Y-) should have high electron gain enthalpy.(III) Released amount of lattice energy (L.E.) must be substantially more.