In which half-equation is the species oxidised?
Answer and explanation
Correct answer: C. Fe²⁺ → Fe³⁺ + e⁻
- Step 1: Oxidation is loss of electrons.
- Step 2: Only Fe²⁺ → Fe³⁺ + e⁻ has electrons on the right-hand side.
Answer
Fe²⁺ → Fe³⁺ + e⁻.
Why not the others: Cl₂ + 2e⁻ → 2Cl⁻: electrons are gained. Cu²⁺ + 2e⁻ → Cu: electrons are gained. Ag⁺ + e⁻ → Ag: electrons are gained.
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