Chemistry 9701 · AS & A Level · States of matter

States of matter — practice question

Under room temperature and pressure, $\text{H}_2\text{O}$ is a liquid whereas $\text{H}_2\text{S}$ is a gas. What causes this difference in state?

  • AO has higher first and second ionisation energies than S.
  • BThe covalent bond between O and H is stronger than the covalent bond between S and H.
  • CThere is significant hydrogen bonding between $\text{H}_2\text{O}$ molecules but not between $\text{H}_2\text{S}$ molecules.
  • DThe instantaneous dipole-induced dipole forces between $\text{H}_2\text{O}$ molecules are stronger than the instantaneous dipole-induced dipole forces between $\text{H}_2\text{S}$ molecules.

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