Q. Iodine readily dissolves in potassium iodide solution giving
A) $I^{-}$
B) $KI^{-}$
C) ${KI}_{2}^{-}$
D) KI_{3}
Explanation
(d)
Iodine readily dissolves in potassium iodide solution giving KI_{3}.
KI + I_{2}⟶KI_{3(aq)}
KI_{3}(aq)⇌$K^{+} +$^{(aq}_{)}+$I_{3}^{-}$(aq)
Note: I_{2} is more soluble in an aqueous solution of KI than in pure water, it is due to the formation of polyhalide ${(I}_{3}^{-}$ ion).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.