Q. The diagram given below represents the vapour pressure and mole fraction of an ideal solution of component and . Answer the following questions.
What does lines I, II and III indicate? Chemistry Question Image

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Solution:

These lines (I and II) pass through the points for which and are equal to unity. The plot (line III) of versus is linear.
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The plot of vapour pressure and mole fraction of an ideal solution at constant temperature i.e. the dashed lines I and II represent the partial pressure of the components. The total vapour pressure is given by line marked III.