The variation of vapour pressure 
as a function of temperature 
is studied for 
and 
at 
and is shown in the figure below. The boiling temperatures of 
and 
are 308,350 and 
respectively. Curves 
respectively correspond to
Text Solution
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Boiling point of a liquid is that temperature at which its vapour pressure becomes equal to the atmospheric pressure. Now, weaker is the attractive force between the molecules of given species, more is its volatile nature and smaller is its boiling point.
Volatile nature 
vapour pressure of 
Force of attraction; 
Now, drawing perpendicular on 
-axis, i.e. on from points 
and 
, we have
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