1) Cr+Cl2 = CrCl2;
2) CrCl2+2NH4OH= Cr(OH)2+2NH4Cl;
3) Cr(OH)2+O2+H2O= Cr(OH)3;
4) 2Cr(OH)3+3H2SO4= Cr2(SO4)3+6H2O;
5) Cr2(SO4)3 +2Al= Al2(SO4)3+2Cr
1) Cr+Cl2 = CrCl2;
2) CrCl2+2NH4OH= Cr(OH)2+2NH4Cl;
3) Cr(OH)2+O2+H2O= Cr(OH)3;
4) 2Cr(OH)3+3H2SO4= Cr2(SO4)3+6H2O;
5) Cr2(SO4)3 +2Al= Al2(SO4)3+2Cr