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JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Wet Test for Acid Radical

  • question_answer
    Aqueous solution of a salt when treated with \[AgN{{O}_{3}}\] solution gives a white precipitate, which dissolves in \[N{{H}_{4}}OH\]. Radical present in the salt is

    A) \[C{{l}^{-}}\]

    B) \[B{{r}^{-}}\]

    C) \[{{I}^{-}}\]

    D) \[NO_{3}^{-}\]

    Correct Answer: A

    Solution :

     When \[C{{l}^{-}}\], \[B{{r}^{-}}\] and \[{{F}^{-}}\] are treated with \[AgN{{O}_{3}}\] solution in presence of dilute \[HN{{O}_{3}}\], corresponding silver halide is obtained which is soluble in \[N{{H}_{4}}OH,\] NaCN, and \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\]. \[AgN{{O}_{3}}\ +\ NaCl\ \xrightarrow{{}}\ \underset{\text{white}}{\mathop{AgCl}}\,\downarrow \ +\ NaN{{O}_{3}}\] \[AgCl\ +\ dil.2N{{H}_{4}}OH\ \xrightarrow{{}}\underset{\text{complex}}{\mathop{\ \left[ Ag{{(N{{H}_{3}})}_{2}} \right]\,Cl\,}}\,+2{{H}_{2}}O\]


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