See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

20 ml gold sol require 36 mg sodium oleate hence 10 ml of given gold sol require 18 mg sodium oleate to protect from coagulation by 3 ml, 20% NaCl (aq). Hence, these 10 ml sol would require 18 3 mg 3 2   . Sodium oleate to protect from coagulation by 1 ml, 10% NaCl (aq).