Cr-cr2o2-crcl2-cr(oh)3-nacro2

Question

Cr-cr2o2-crcl2-cr(oh)3-nacro2

Answer 1

Cr -> Cr2O3 -> CrCl3 -> Cr(OH)3 -> NaCrO2
1) 4Cr + 3O2 -> 2Cr2O3
2) Cr2O3 + 6HCl -> 2CrCl3 + 3H2O
3) CrCl3 + 3NaOH -> Cr(OH)3 + 3NaCl
4) Cr(OH)3 + NaOH -> NaCrO2 + 2H2O