An aqueous solution is `1.00` molal in `KI`. Which change will cause the vapor pressure of the solution to increase?

Options

A. Addition of water
B. Addition of NaCl
C. Addition of `Na_(2)SO_(4)`
D. Addition of 1.00 molal KI

Answer

A

Explanation

According to raoult’s low
`P_(s)=PX_(A)` (`X_(A)` = mole fraction of solvent)
and on addition of water the mole fraction of water in the solution increases therefore vapour pressure increases.