Consider the following table<table border=\"1\" cellpadding=\"1\" cellspacing=\"1\" style=\"width:100%\"><tr><td>Substitute</td><td>Meltig point / ºC</td><td>Boiling point / ºC</td></tr><tr><td>P</td><td>- 78</td><td>-25</td></tr><tr><td>Q</td><td>- 8</td><td>40</td></tr><tr><td>R</td><td> - 6</td><td>150</td></tr><tr><td>S</td><td>44</td><td>280</td></tr></table>Which of the substances is a liquid at room temperature and rapidly evaporates on exposure to air?

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 room temperature and rapidly evaporates on exposure to air?

Consider the following table

Which of the substances is a liquid at room temperature and rapidly evaporates on exposure to air?

The correct answer is B. Q

Q has slightly lower boiling point which when expose to air may evaporate rapidly.