Question

Which one of the following will dissolve in water most readily?

• A. $ I_{2} $
• B. $ BaCO_{3} $
• C. $ KF $
• D. $ PbI_{2} $

Answer 1

Answer: (C)

Water is a polar solvent and like dissolves like, so more polar compound is readily soluble in water
All the alkali halides except lithium fluoride are freely soluble in water. $I_{2}$ (non-polar) is least soluble in water. Group $IIA$ carbonates $(BaCO_{3} )$ are insoluble in water. $PbI_{2}$ is sparingly soluble in cold water but quite soluble in hot water. $KF$ (most olar) is most readily soluble in water