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: Use Raoult's law

Explanation:

According to Raoult's law, the partial vapour pressure of a component in an ideal mixture is equal to the vapour pressure of the pure component multiplied by its mole fraction.

Depending on the vapor pressures of the pure components 1 and 2, total vapor pressure over the solution decreases or increases with the increase of the mole fraction of component 1.

What is Raoult's Law

Hence, option 4 is the correct answer.

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