Đáp án + Giải thích các bước giải:

a,

`-(1):MnO_2+4HCl->MnCl_2+Cl_2+H_2`$\\$ `-(2):H_2+Cl_2->2HCl`$\\$ `-(3):3Cl_2+2Fe->2FeCl_3`$\\$ `-(4):2FeCl_3+Fe->3FeCl_2`$\\$ `-(5):Cl_2+2NaOH->NaCl+NaClO+H_2O`

b,

`-(1):MnO_2+4HCl->MnCl_2+Cl_2+H_2`$\\$ `-(2):3Cl_2+2Fe->2FeCl_3`$\\$ `-(3):FeCl_3+3NaOH->Fe(OH)_3+3NaCl`$\\$ `-(4):2NaCl+2H_2O->2NaOH+Cl_2+H_2`$\\$ `-(5):Cl_2+Cu->CuCl_2`$\\$ `-(6):CuCl_2+2AgNO_3->Cu(NO_3)_2+2AgCl`

c,

`-2F_2+2H_2O->4HF+O_2`

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