An aqueous solution of KI is 1.0 molal in KI. Which change will cause the vapour pressure of the solution to increases ?

Options

A. Addition of NaCI
B. Addition of `Na_(2)SO_(4)`
C. Addition of 1.0 molaol KI
D. Addition of water

Answer

b

Explanation

Addition of water decreases the concentration of the KI solution. Therefore, its vapour its vapour pressure increases. All other solutes being ionic in nature, increases the concentration of the solution. Therefore, the vapour pressure of the soution gets lowerd.