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

  • question_answer
    \[A{{l}^{3+}},\] \[F{{e}^{3+}},\]  \[Z{{n}^{2+}}\]and \[N{{i}^{2+}}\] ions are present in an acidic solution. Excess of ammonium chloride solution is added followed by addition of ammonium hydroxide solution. The available precipitate will contain [MP PMT 1996]

    A) \[Zn{{\left( OH \right)}_{2}}\] and \[Ni{{\left( OH \right)}_{2}}\]

    B) \[Al{{\left( OH \right)}_{3}}\] and \[Fe{{\left( OH \right)}_{3}}\]

    C) \[Zn{{\left( OH \right)}_{2}}\] and \[Al{{\left( OH \right)}_{3}}\]

    D) \[Ni{{\left( OH \right)}_{2}}\] and \[Fe{{\left( OH \right)}_{3}}\]

    Correct Answer: B

    Solution :

    As the concentration of \[O{{H}^{-}}\]ions is less due to common ion effect but enough to precipitate the IIIrd group radicals as hydroxides, as the solubility product of III group hydroxides is lower than IV, V and VI group hydroxides.


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