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Identify the catalyst used in the reaction between Iodide and persulphate ions. 2 I ⁻+ S ₂ O ₈ ²⁻ I ₂+2 SO ₄ ²⁻

Options

  1. AFe ³⁺
  2. BCr ³⁺
  3. CFe ²⁺
  4. DNi ²⁺

Correct answer

A. Fe ³⁺

Step-by-step solution

The reaction between iodide ions and persulphate ions is represented by the equation 2 I ⁻ + S ₂ O ₈²⁻ I ₂ + 2 SO ₄²⁻ . This reaction is known to be catalyzed by iron(III) ions, Fe ³⁺ . The mechanism involves the oxidation of iodide by Fe ³⁺ to form I ₂ and Fe ²⁺ , followed by the oxidation of Fe ²⁺ back to Fe ³⁺ by the persulphate ion, thereby regenerating the catalyst. Answer: Fe ³⁺

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