KCET2024ChemistrySurface Chemistry
For the coagulations of positively charged hydrated ferric - oxide sol, the flocculating power of the ions is in the order:
Options
- APO ₄³⁻ SO ₄²⁻ Cl ⁻ [ Fe ( CN )₆ ]⁴⁻
- BCl ⁻ SO ₄²⁻ PO ₄³⁻ [ Fe ( CN )₆ ]⁴⁻
- CSO ₄²⁻= Cl ⁻= PO ₄³⁻= [ Fe ( CN )₆ ]⁴⁻
- D[ Fe ( CN )₆ ]⁴⁻ PO ₄³⁻ SO ₄²⁻ Cl ⁻
Correct answer
D. [ Fe ( CN )₆ ]⁴⁻ PO ₄³⁻ SO ₄²⁻ Cl ⁻
Step-by-step solution
Generally, greater the valence of the flocculating ion added, the greater is its power to cause precipitation. This is called as Hardy-Schulze rule. So according to Hardy-Schulze rule the flocculating power of the ions is in the order [ Fe ( CN )₆ ]⁴⁻ PO ₄³⁻ SO ₄²⁻ Cl ⁻