The variation of vapour pressure of different liquids with temperature is shown in the figure.
(i) Calculate graophically boiling points of liquids A and B.
(ii) If we take liquid C in a closed vessel and heat it continuosly, at what tempeature will it boil ?
(iii) At high altitude, atmosopheric pressure is low (say `60 mm Hg`). At what temperature liquid D boils?

Explanation

Please remember that a liquid boils at a temperature when the vapour pressure on its surface becomes equal to atmospheric pressure. It depends upon the height or altitude of the place.
(i) The boiling point of liquid A is approximatly 300 K and that of liquid B, it is approximately 315 K.
(iii) If the atmosophric pressure is close to 60 mm, the liquid D will boil at about 313 K.