Cr2(so4)3-cr(Oh)3--cr2o3--cr--cr2s3

Question

Cr2(so4)3-cr(Oh)3--cr2o3--cr--cr2s3

Answer 1

Cr2(SO4)3 + 6NaOH --> 2Cr(OH)3 серо-зеленый осадок + 3Na2SO4
2Cr(OH)3 = Cr2O3 + 3H2O
Cr2O3 + 2Al --> Al2O3 + 2Cr
2Cr + 3S -> Cr2S3