Chemistry 9701 · AS & A Level · States of matter

States of matter — practice question

The boiling points for several hydrogen halides are listed. $\mathrm{H\text{-}Cl}$: $188\,\text{K}$, $\mathrm{H\text{-}Br}$: $206\,\text{K}$, $\mathrm{H\text{-}I}$: $238\,\text{K}$. Explain the reason for the trend in boiling point from $\mathrm{HCl}$ to $\mathrm{HI}$?

  • AThe bond energies of the hydrogen halides increase from $\mathrm{HCl}$ to $\mathrm{HI}$.
  • BThere is an increase in the strength of the intermolecular forces of attraction from $\mathrm{HCl}$ to $\mathrm{HI}$.
  • CThe intermolecular hydrogen bonds become stronger from $\mathrm{HCl}$ to $\mathrm{HI}$.
  • DThere is an increase in the bond polarity from $\mathrm{HCl}$ to $\mathrm{HI}$.

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