Question

The effective ion used in cleaning water from dirt particles is:

• A. ${Al}^{3+}$
• B. ${Ca}^{2+}$
• C. ${SO}_4^{2-}$
• D. $P{O}_4^{3-}$

Answer 1

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

According to Hardy Schulze rule which states that Higher is the valency of the active ion, greater will be its power to precipitate the sol, hence $A{l}^{3+}$ is most effective in cleaning water as it coagulates the negatively charges suspended particles in the which which becomes increased in size and settle down.