Đáp án:
Giải thích các bước giải:
`a,`
`MnO_2+4HCl->MnCl_2+Cl_2+2H_2O`
$3Cl_2+2Fe\xrightarrow{t^o}2FeCl_3$
`FeCl_3+3NaOH->Fe(OH)_3+3NaCl`
`2NaCl_{Rắn}+H_2SO_4_{đặc}->Na_2SO_4+2HCl`
`2HCl+CuO->CuCl_2+H_2O`
`CuCl_2+2AgNO_3->2AgCl+Cu(NO_3)_2`
$2AgCl\xrightarrow{as}2Ag+Cl_2$
`b,`
$2NaCl+2H_2O\xrightarrow{đpmn}2NaOH+Cl_2+H_2$
`Cl_2+H_2->2HCl`
`6HCl+Fe_2O_3->2FeCl_3+3H_2O`
`FeCl_3+3AgNO_3->Fe(NO_3)_3+AgCl`
$2AgCl\xrightarrow{as}2Ag+Cl_2$
$2Fe+3Cl_2\xrightarrow{t^o}2FeCl_3$
$FeCl_3+3NaOH->Fe(OH)_3+3NaCl$
$2Fe(OH)_3\xrightarrow{t^o}Fe_2O_3+3H_2O$
$Fe_2O_3+3H_2\xrightarrow{t^o}2Fe+3H_2O$
`Fe+2HCl->FeCl_2+H_2`
`FeCl_2+2NaOH->2NaCl+Fe(OH)_2`
$2NaCl+2H_2O\xrightarrow{đpmn}2NaOH+Cl_2+H_2$
`Cl_2+2NaOH->NaCl+NaClO+H_2O`
