Ncert Exercises & Solutions

The unit that relates concentration of solution with its vapour pressure is:

1.	Mole fraction.	2.	Parts per million.
3.	Mass percentage.	4.	Molality.

HINT: Henry's law

Explanation:

According to Henry's law partial pressure of gas in the solution is proportional to the mole fraction of gas in the solution.

p = K_H x

where, K_H =Henry’s constant

Hence, (1) mole fraction is the correct choice.