Read the Assertion and Reason below and choose the correct option. — Surface Chemistry Chemistry Question

💡 Solution & Explanation

Addition of an electrolyte provides oppositely charged ions that neutralize the charge on the colloidal particles, causing them to aggregate and coagulate. According to the Hardy-Schulze rule, the effectiveness (and rate) of coagulation is strongly dependent on the valency (magnitude) and the opposite sign of the coagulating ion. Therefore, correct answer is A.