Chemistry - Surface Chemistry Question with Solution | TestHub
Consider the formation of a delta where a river enters the ocean. The river water contains suspended clay (negatively charged) and organic matter. The ocean contains various salts . Which of the following is/are correct regarding this process?
Options:(select one or more)
Answer:
Solution:
Concept: Hardy-Schulze Rule, Delta Formation, Mutual Coagulation, Protection of Colloids.
Solution:
1. Option A: Correct. According to the Hardy-Schulze rule, coagulation power . Mg²⁺ is more effective than Na⁺ for negatively charged clay.
2. Option B: Incorrect. Lower salinity means slower coagulation and more transport of silt further into the sea, potentially spreading the delta or preventing a localized buildup. However, the total mass remains the same; the question implies the efficiency of the process.
3. Option C: Correct. River water is a mixture. If oppositely charged sols meet, they neutralize and precipitate (Mutual Coagulation).
4. Option D: Incorrect. Anionic surfactants would provide more negative charge/steric hindrance to the clay, potentially stabilizing it and delaying coagulation (acting as a protective colloid).
Final Answer: Option (A & C)