1) 4Cr + 3O2 = 2Cr2O3
2) Cr2O3 + 3C = 2Cr + 3CO
3) 2Cr + 6H2SO4(к) = Cr2(SO4)3 + 3SO2 + 6H2O
4) Cr2(SO4)3 + 12NaOH = 2Na3[Cr(OH)6] + 3Na2SO4
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Answers & Comments
1) 4Cr + 3O2 = 2Cr2O3
2) Cr2O3 + 3C = 2Cr + 3CO
3) 2Cr + 6H2SO4(к) = Cr2(SO4)3 + 3SO2 + 6H2O
4) Cr2(SO4)3 + 12NaOH = 2Na3[Cr(OH)6] + 3Na2SO4