Ncert Exercises & Solutions

For a binary ideal liquid solution, the curve that represents the variation in total vapor pressure versus composition of the solution is:

a.		b.
c.		d.

The correct option is:
1. a and b
2. b and c
3. c and d
4. a and d

Hint: Raoult's law

Depending on the vapour pressures of the pure components 1 and 2, total vapour pressure over the solution decreases or increases with the increase of the mole fraction of component 1. Hence, option 4 is the correct answer.

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