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MHT CET202522 Apr 2025Evening ShiftChemistrySurface ChemistryActual

Which of the following ion exihibits maximum power of coagulation for positively charged sol?

Options

  1. ASo ₄²⁻
  2. BCl ⁻
  3. CPO ₄³⁻
  4. D[ Fe ( CN )₆ ]⁴⁻

Correct answer

D. [ Fe ( CN )₆ ]⁴⁻

Step-by-step solution

Coagulating power depends on the valency of the active ion, as per the Hardy-Schulze rule. For positively charged sols, anions serve as the active ions. Comparing valencies: A) SO ₄²⁻ : valency 2 B) Cl ⁻ : valency 1 C) PO ₄³⁻ : valency 3 D) [ Fe ( CN )₆ ]⁴⁻ : valency 4 Since coagulating power increases with valency, the highest valency (4) corresponds to maximum coagulation.

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