1.

Breding arc method cannot be used to prepare colloidal solutionof which of the following ?

Answer»

`Pt`
`Fe`
`Ag`
`Au`

Solution :Electrical disintegration of Bredigs are METHOD is used for preparing colloidal solution of metal 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.
`2AuCl_(3)+3SnCl_(2)rarrunderset("Gold sol")(2Au+3SnCl_(4))`


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