Among the electrolytes Na₂SO₄, CaCl₂, Al₂(SO₄)₃ and NH₄Cl, the most effective coagulating agent for — Surface Chemistry Chemistry Question
Question
Among the electrolytes Na₂SO₄, CaCl₂, Al₂(SO₄)₃ and NH₄Cl, the most effective coagulating agent for Sb₂S₃ is
Answer: C
💡 Solution & Explanation
Sb₂S₃ is a negatively charged sulphide sol. According to the Hardy-Schulze rule, an electrolyte providing a cation with a higher positive charge will be more effective. Al³⁺ (from Al₂(SO₄)₃) has the highest valency (+3). Therefore, correct answer is C.
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