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J & K CET Engineering J and K - CET Engineering Solved Paper-2009

  • question_answer
    When an excess and a very dilute aqueous solution of\[\text{KI}\]is added to a very dilute aqueous solution of silver nitrate, the colloidal particles of silver iodide are associated with the Helmholtz double layer

    A)  \[AgI:A{{g}^{+}}:NO_{3}^{-}\]

    B)  \[AgI:{{K}^{+}}:NO_{3}^{-}\]

    C)  \[AgI:NO_{3}^{-}:A{{g}^{+}}\]

    D)  \[AgI:{{I}^{-}}:{{K}^{+}}\]

    Correct Answer: D

    Solution :

     The Helmholtz double layer contains a layer of opposite charges on the surface of colloidal particles. \[AgN{{O}_{3}}+\underset{\text{excess}}{\mathop{KI}}\,\xrightarrow{{}}AgI+KN{{O}_{3}}\] \[AgI+KI\xrightarrow{{}}AgI:{{I}^{-}}:{{K}^{+}}\]


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