Question

Solubility of iodine in water may be increased by adding

• A. Chloroform
• B. Potassium iodide
• C. Carbon disulphide
• D. Sodium thiosulphate

Answer 1

Answer: (B)

The solubility of $I_2$ in water increases by the addition of KI due to formation of polyhalide ion
i.e. $l_3^{-}KI+I_2\to K{I}_3$
or $I^{-}+I_2\to I_3^{-}$