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NEET Sample Paper NEET Sample Test Paper-27

  • question_answer
    The only cations present in a slightly acidic solution and \[F{{e}^{3+}},Z{{n}^{2+}}\] and \[C{{u}^{2+}}\]. The reagent that when added in excess to this solution would identify and separate \[F{{e}^{3+}}\] in one step is:

    A)  \[2\text{ }M\text{ }HCl\]                   

    B)  \[\text{6 }M\text{ N}{{\text{H}}_{3}}\]

    C)  \[\text{6 }M\text{ NaOH}\]               

    D)  \[{{\text{H}}_{2}}\text{S}\] gas

    Correct Answer: B

    Solution :

    \[F{{e}^{3+}}+Z{{n}^{3+}}+C{{u}^{2+}}\xrightarrow{6MN{{H}_{3}}}\underset{Brown\,\,ppt.}{\mathop{Fe{{(OH)}_{3}}}}\,+\underset{\text{Soluble}}{\mathop{{{\left[ Zn{{\left( N{{H}_{3}} \right)}_{4}} \right]}^{2+}}}}\,\]\[\underset{\text{Soluble}}{\mathop{+{{\left[ Cu{{\left( N{{H}_{3}} \right)}_{4}} \right]}^{2+}}}}\,\]


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