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2Cr → 2Cr^3+ + 6e^- | · 1
SO4^2- + 4H^+ + 2e^- → SO2 + 2H2O | · 3
2Cr + 6H2SO4 → Cr2(SO4)3 + 3SO2 + 6H2O
Cr2O3 + O2 + KOH → K2CrO4 + H2O
Cr2O3 + 10OH^- →2CrO4^2- + 5H2O + 6e^- | · 2
O2 + 2H2O + 4e^- → 4OH^- | · 3
2Cr2O3 + 8KOH + 3O2 → 4K2CrO4 + 4H2O
Cr + HNO3 → Cr(NO3)3 + NO + H2O
Cr → Cr^3+ + 3e^- | ·1
NO3^- + 4H^+ + 3e^- → NO + 2H2O | ·1
Cr + 4HNO3 → Cr(NO3)3 + NO + 2H2O
proszę :)