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Balance the following Redox reactions using the line method.. Show all work including all oxidation numbers, which species are oxidized and reduced, oxidation/reduction agents, correct coefficients.
1) Al(s) + MnO2(s) --> Al2O3(s) + Mn(s)
2) HNO3(aq) + H2S(g) --> S(s) + NO(g) + H2O(l)
3) CH4(g) + O2(g) --> CO2(g) + H2O(l)
4) K2Cr2O7(aq) + HCl(aq) --> KClaq) + CrCl3(aq) + H2O(l) + Cl2(g)