Question

Positively charged colloid is coagulated by positive ion. Enter 1 if true else enter 0

Answer 1

Positively charged colloid is coagulated by negatively charged ion and vice versa. Hence, the given statement is incorrect. Coagulation by addition of an electrolyte to the collodial solution is due to the neutralisation of charge on colloidal particles.

Thus, $A{l}_2{S}_3$ sol is coagulated by addition of aluminium sulphate solution. $A{l}^{3+}$ ions are responsible for the coagulation of negatively charged sol.