An aqueous solution is 1.00 molalin KI. Which change will cause the vapour pressure of the solution to increase ?

Options

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

Answer

B

Explanation

According to Raoult.s law .
`p_(s) = p^(@) x_(A)` (`x_(A)` = mole fraction of solvent)
On addition of water , the mole fraction of water the solution increases, therefore vapour pressure increases.