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  4. The lattice energies of NaCl, NaF, KCl and RbCl follow the order

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Q. The lattice energies of $NaCl, NaF, KCl$ and $RbCl$ follow the order

KVPYKVPY 2017Chemical Bonding and Molecular Structure

Solution:

Lattice energy is the energy required to completely separate one mole of a solid ionic compound into gaseous constituent. Lattice energy increases with decrease in the size of ions. This is because as the size of ion is less, intermolecular distance will be less and so forces of attraction is greater. Thus, the correct increasing order of lattice energies is,
$RbCl < KC1 < NaCl < NaF.$