Question

Among the following statements,

(1) For coagulation of $A{s}_2{S}_3$ sol, +ve ions are effective.
(2) For coagulation of aluminium hydroxide solution, $B{a}^{2+}$ ions are more effective than $N{a}^{+}$.
(3) Cellulose solution is an example of the multimolecular colloid system.
(4) A colloidal solution of metals such as gold, silver etc are prepared by Bredig's arc method.
(5) The migration of colloidal particles under the influence of an electric field is known as electro-osmosis.

The number of incorrect statements is ______.

Answer 1

The number of incorrect statements is $3$.

The correct form of the statements are given below:

(2) Aluminium hydroxide is a positive solution. So, negative ions are effective in coagulation.

(3) Cellulose solution is an example of macromolecular colloid.

(5) The migration of colloidal particles under the influence of an electric field is known as electrophoresis.