Question

Which of the following will have the highest coagulating power for ${As}_2{S}_3$ colloid?

• A. ${PO}_4^{3-}$
• B. ${Al}^{3+}$
• C. ${SO}_4^{2-}$
• D. ${Na}^{+}$

Answer 1

The correct option is B ${Al}^{3+}$

Arsenious sulphide is negatively charged saol, hence it will be coagulated be positive ion having maximum amount of charge hence, $A{l}^{3+}$ have maximum coagulating power.