A) Pt
B) Fe
C) Ag
D) Au
Correct Answer: B
Solution :
Electrical disintegration or Bredigs arc method is used for preparing colloidal solution of metals like gold silver, platinum, etc. 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. A colloidal solution of Au, Ag and Pt can also be prepared by reducing its salt solution with suitable reducing agent. \[2\,AuC{{l}_{3}}+3SnC{{l}_{2}}\xrightarrow{{}}\underset{Gold\,sol}{\mathop{2Au+}}\,3SnC{{l}_{4}}\]
You need to login to perform this action.
You will be redirected in
3 sec
