Would Have the Lowest Vapor Pressure?

When comparing vapor pressures we need to be making comparisons at the same temperature. Thus at room temperature, the substance with the lowest boiling point will have the highest vapor pressure (easiest to get into the gas phase). The substance with the highest boiling point will have the lowest vapor pressure.

Which has lowest vapor pressure?

Therefore, the option D is correct. Mercury exerts the lower vapour pressure because of the strong bond among its atom. Note: At room temperature, the substance with lowest boiling point will have the highest vapour pressure and the substance with highest boiling point will have the lowest vapour pressure.

Is most likely to have the lowest vapor pressure?

The substance with the strongest intermolecular forces would be expected to have the lowest vapor pressure. Both NH3 and H2O exhibit hydrogen bonding whereas the others have only dispersion and/or dipole-dipole interactions.