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Problem 5 - Olympiad
Which of the following is NOT a method for coagulating a colloidal sol?
A. Adding an electrolyte
B. Refluxing for prolonged time
C. Passing X-rays
D. Excess addition of peptizing agent
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Correct: D
Peptizing agents stabilize colloids rather than coagulate them. Coagulation occurs via neutralization of charge, heating, or mixing oppositely charged colloids.