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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Colloids Emulsion, Gel and Their properties with application

  • question_answer
    Bredig arc method can not be used to prepare colloidal solution of which of the following             [AFMC 2004]

    A)                 Pt           

    B)                 Fe

    C)                 Ag

    D)                 Au

    Correct Answer: B

    Solution :

                    Bredig's arc method is suitable for the preparation of colloidal solution of metal like gold silver, platinum etc. An arc is struck between the metal electrode under the surface of water containing some stabilizing agent such as a trace of KOH. However, Fe does not react with alkalies that is why it is not obtained by Bredig's arc method.


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