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CMC Medical CMC-Medical VELLORE Solved Paper-2008

  • question_answer
    Which of the following metals in solution forms a precipitate with\[NaOH,\]which is not soluble in an excess of the base?

    A)  Fe                                         

    B)  Sn

    C)  Pb                                         

    D)  Zn

    E)  Al

    Correct Answer: A

    Solution :

                    Iron (Fe) metal in solution forms a red brown precipitate with \[NaOH\]and this precipitate is not soluble in an excess of the base. \[FeC{{l}_{3}}+3NaOH\xrightarrow{{}}\underset{\begin{smallmatrix}  \text{ferric}\,\,\text{hydroxide} \\  (red\,\,brown\,\,ppt.) \end{smallmatrix}}{\mathop{Fe{{(OH)}_{3}}}}\,+3NaCl\] While the precipitate of Sn, Pb, Zn and all hydroxides are soluble in the excess of base.


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