(a) Explain the terms 'oxidation' and 'reduction' with reference to an atom or ion.
(b) State which of the following are oxidation reactions and which are reduction reactions:
(i) Cu ➞ Cu²⁺ + 2e⁻
(ii) Cu²⁺ + 2e⁻ ➞ Cu
(iii) Sn⁴⁺ + 2e⁻ ➞ Sn²⁺
(iv) 2Cl- ➞ Cl₂ + 2e⁻
(v) Fe²⁺ ➞ Fe³⁺ + le⁻
(vi) X + 2e⁻ ➞ X²⁻
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