Question

Which of the following is most powerful to coagulate the negative colloid?

Options

• ZnSO₄

• Na₃PO₄

• AlCl₃

• K₄[Fe(CN)₆]

Answer 1

AlCl₃

Explanation:

According to the Hardy-Schulze rule, “The amount of electrolyte required to coagulate a fixed amount of a sol depends upon the sign of charge and valency of the flocculating ion.”

As a result, the coagulating power varies in the order.

Al³⁺ > Zn²⁺ > Na⁺