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Among the electrolytes Na ₂ SO ₄, CaCl ₂ Al ₂ ( SO ₄ )₃ and NH ₄ Cl , the most effective coagulating agent for Sb ₂ ~S ₃ sol is

Options

  1. ANa ₂ SO ₄
  2. BCaCl ₂
  3. CAl ₂ ( SO ₄ )₃
  4. DNH ₄ Cl

Correct answer

C. Al ₂ ( SO ₄ )₃

Step-by-step solution

Sb ₂ ~S ₃ is an anionic sol ₂ , therefore cation of highest valency ( Al ³⁺ in the present case) would be most effective coagulating agent.

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