12th Class Chemistry Surface Chemistry / सतह रसायन

  • question_answer 67)
        Which of the following substances will precipitate the negatively charged emulsions? (a) KCI                                   (b) Glucose       (c) Urea                                (d) NaCI

    Answer:

                        (a, d) The droplets present in emulsion has negative charge. It can be precipitated by adding electrolyte such as KCI, NaCI etc. Since, glucose and urea do not produce ions on dissolving in water. Hence, they are non-electrolyte and do not precipitate the negatively charged emulsion.


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