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BITSAT2012ChemistrySurface ChemistryActual

Which of the following will be the most effective in the coagulation of Fe ( OH )₃ soil?

Options

  1. AMg ₃ ( PO ₄ )₂
  2. BBaCl ₂
  3. CNaCl
  4. DKCN

Correct answer

A. Mg ₃ ( PO ₄ )₂

Step-by-step solution

According to Hardy-Schulze rule, coagulation power of ions is directly proportional to charge on ion. Fe ( OH )₃ is positively charged colloid. It will be coagulated by anion. (a) Mg ₃ ( PO ₄ )₂ 3 Mg ²⁺+2 PO ₄³⁻ (b) BaCl ₂ Ba ²⁺+2 Cl ⁻ (c) NaCl Na ⁺+ Cl ⁻ (d) KCN K ⁺+ CN ⁻ Because PO ₄³⁻ has highest charge among the given anions, therefore, Mg ₃ ( PO ₄ )₂ is the most effective in the coagulation of Fe ( OH )₃ solution.

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