JEE Main & Advanced Chemistry The p-block Elements-II Question Bank Halogen Family

  • question_answer The solubility of iodine in water increases in the presence of [CPMT 1973, 74, 78, 86, 89, 91; NCERT 1973; AFMC 1995]

    A) Alcohol

    B) Chloroform

    C) Sodium hydroxide

    D) Potassium iodide

    Correct Answer: D

    Solution :

    Iodine has the least affinity for water and is only slightly soluble in it. However, it dissolves in 10% aq. solution of KI due to the formation of a complex ion i.e. \[2NaCl+2{{H}_{2}}O\,\,\to \,\,2NaOH+\underset{\text{(anode)}}{\mathop{C{{l}_{2}}}}\,+\underset{\text{(cathode)}}{\mathop{{{H}_{2}}}}\,\].        \[{{I}_{2}}+KI\] ⇌\[2{{F}_{2}}+2{{H}_{2}}O\,\to \,4HF+{{O}_{2}}\] or   \[{{I}_{2}}+{{I}^{-}}\] ⇌ \[I_{3}^{-}\] (complex ion)

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