giai thich ho minh tai sao dap an A

A

anhtraj_no1

H+ + OH- --> H2O
H+ + S2- ---> H2S
Ba 2+ + SO4 2- --> BaSO4
Fe3+ + S2- ---> Fe2+ + S
Fe3+ + OH- ---> Fe(OH)3
Fe2+ + OH- ---> Fe(OH)2
Fe2+ + S 2- ---> FeS
 
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