Question

Which of the following is positively charged colloidal particle?

• A. $Ag$
• B. ${Al}_2{O}_3.H_{2}O$
• C. $Au$
• D. $Pt$

Answer 1

The correct option is B ${Al}_2{O}_3.H_{2}O$

Arsenic trisulphide $Au,Ag,Cu,Pt$ are negatively charged colloid as in upper carius arm experiment it will move towards the positive charge.

While metallic oxides $A{l}_2{O}_3\cdot x{H}_{2}O$ is a positively charged solution.