The incorrect statements are -

Options

A. For coagulation of `As_(2)S_(3)` sol, +ve ions are effective.
B. For coagulation of aluminium hydroxide sol `Ba^(2+)` ions are more effective than `Na^(+)`
C. Cellulose solution is an example of multimolecular colloid system
D. Colloidal sol of metals such as gold, silver etc are prepared by Bredig's arc method.

Answer

B, C

Explanation

(B) Aluminium hydroxide is a +ve sol, so -ve ions are effective in coagulation.
(C) Cellulose solution is an example of macromolecular colloid.