The forces acting between noble gas atoms are

Solid $PCl_5$ exists as

The lattice enthalpy of an ionic compound is the enthalpy change when one mole of an ionic compound in its solid state dissociates into its ions in the gaseous state. It is impossible to determine it directly by experiment. Suggest and explain an indirect method to measure the lattice enthalpy of $NaCl_{(s)}$.

What are intermolecular forces and van der Waals forces? Which forces are not included in them? Explain their types and uses.

Explain dipole-induced dipole forces.

Which of the following has the highest melting point?