Q. An oil-soluble dye is mixed with an emulsion and emulsion remains colourless. Then, it is

 1618  207 Surface Chemistry Report Error

Solution:

When an oil-soluble dye is shaken with the given emulsion, if the emulsion (whole background) is coloured, the emulsion is W/O type but if only coloured drops are seen and emulsion (whole background) is colourless, it is O/W type emulsion.