Question

On which of the following properties does the coagulating power of an ion depend?

A. Both magnitude and sign of the charge on the ion.

B. The magnitude of the charge on the ion alone

C. The sign of the charge on the ion alone

D. Size of the ion alone.

Answer 1

Coagulation is a procedure of joining together the colloidal particles so as to modify them into large-sized particles which at last settle as a precipitate. Another name for coagulation is precipitation. Coagulation is generally brought by the addition of electrolyte.

Complete step-by-step answer:

Hardy Schulze Rule: The coagulation capacity of various electrolytes is different. It relies on the valency of the active ion called a flocculating ion, which is the ion carrying charge contrasting to the charge on the colloidal particles.

“According to Hardy Schulze rule, more the valency of the active ion or flocculating ion more will be its coagulating power”.

-Thus, Hardy Schulze law state:

(i) The particles carrying the charge opposite to that of sol particles is fruitful in causing a coagulation of the sol.

(ii) The coagulating power of an electrolyte is directly proportional to the valency of the active ions (ions causing coagulation).

Thus, the coagulating power on an ion depends on both magnitude and sign of the charge on the ion.

Hence, the correct option is A.

Note: The possibility to make a mistake is that you may choose option C. As we know that the coagulating power depends on the valency but it not only depends on the sign of the charge but magnitude also.