Consider the following table Substitute Meltig point / ºC Boiling point / ºC P - 78 -25 Q - 8 40 R - 6 150 S 44 280 Which of the substances is a liquid at r...

Answer Details

The substance that is a liquid at room temperature and rapidly evaporates on exposure to air is Q. This is because its boiling point is 40 ºC which is lower than room temperature, and it will therefore be a liquid at room temperature. Additionally, it has a relatively low boiling point compared to the other substances in the table, indicating that it will evaporate quickly on exposure to air.