Choose the balanced equation(s) from the given:
(i) Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
(ii) Fe + CuSO₄ → FeSO₄ + Cu
(iii) KClO₄⁻ → KCl + 2O₂
(iv) Cu + 2HNO₃ → Cu(NO₃)₂ + 2NO₂ + H₂O
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