The substance that has the lowest boiling point is

Which of the following intermolecular forces are present in solid hydrogen?

Identify the types of intermolecular forces present between the molecules of the following substances: $HF-HF$,$O_2-O_2$,$CH_4-CH_4$,$HF-H_2$,$CO$,$NO$,and $H_2O-H_2O$.

In which molecule is the van der Waals force likely to be the most important factor in determining the melting point $(m.pt.)$ and boiling point $(b.pt.)$?

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 $NaCl_{(s)}$.