What oxidation state change does each metal undergo in the following reactions or half-reactions? (a) [CrO7- +
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What oxidation state change does each metal undergo in the following reactions or half-reactions?
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(a) [Cr₂O7²- + 14H+ +6e2Cr³+ (b) 2K + 2H₂O2KOH + H₂ (c) Fe₂O3 + 2A1 2Fe + Al₂O3 A (d) [MnO4] + 2H₂O + 3e MnO₂ + 4[OH] -2Cr³+ + 7H₂O
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