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Verified answer
(1).Mg → Mg²⁺ + 2e (kalikan 2)
O₂ + 4e → 2O²⁻
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2Mg + O₂ → 2Mg²⁺ + 2O²⁻
Menjadi
2Mg + O₂ → 2MgO (setara)
(5).
Cr₂O₇²⁻ + 14H⁺ + 6e → 2Cr³⁺ + 7H₂O
Fe²⁺ → Fe³⁺ + e (kalikan 6)
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Cr₂O₇²⁻ + 6Fe²⁺ + 14H⁺ → 2Cr³⁺ + 6Fe³⁺ + 7H₂O. (setara)