Which of the following sols is not prepared by Bredig's Arc
method?
Gold sol
Sulphur sol
Silver sol
Platinum sol
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Answer:
In this method electric arc is struck between electrodes of metal immersed in the dispersion medium. The intense heat produced vaporizes some of the metals which then condenses to form particles of colloidal size. As iron do not vaporise easily, it cannot be prepared by this method.
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