What oxidation state change does each metal undergo in the following reactions or half-reactions?
(a) [Cr207]2- + 14H+ + 6e– ⇾ 2Cr3+ + 7H2O
(b) 2K + 2H2O ⇾ 2KOH + H2
(c) Fe2O3 + 2A1 ⇾ 2Fe + Al2O3
(d) [Mn04]– + 2H2O + 3e– ⇾ MnO2 + 4[OH]–
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