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1) Al0 is oxidized, Mn+4 is reduced, MnO2 is oxidizing agent, Al is reducing agent, coefficients - 4,3,2,3
2) S-2 is oxidized, N+5 is reduced, HNO3is oxidizing agent, H2S is reduced agent, coefficients - 2,3,3,2,4
3) C-4 is oxidized, O2 is reduced, O2 is oxidizing agent, CH4 is reduced agent, coefficients - 1,2,1,2
4) Cl -1 is oxidized, Cr+6 is reduced, K2Cr2O7 is oxidizing agent, HCl is reduced agent, coefficients - 1,14,2,2,7,3