Question
Chemistry Question on Colloids
Colloidal solution of gold is prepared by:
A
colloidal-mill method
B
reduction method
C
double decomposition method
D
Bredigs arc method
Answer
Bredigs arc method
Explanation
Solution
Metal colloides are generally prepared by Bredigs arc method. In this method electrodes of metal are dipped in dispersion medium and electricity is passed. The colloidal size particles of metal go into the medium and form colloid.