2 câu trả lời
PTHH:
MnO2+4HClto→MnCl2+Cl2+2H2O
\text{Cl$_{2}$+H$_{2}$$\xrightarrow[]{ánh sáng}$2HCl}
\text{Fe+2HCl→FeCl$_{2}$+H$_{2}$}
\text{2FeCl$_{2}$+Cl$_{2}$$\xrightarrow[]{t^o}$2FeCl$_{3}$}
\text{FeCl$_{3}$+3NaOH→Fe(OH)$_{3}$+3NaCl}
\text{2Fe(OH)$_{3}$$\xrightarrow[]{t^o}$Fe$_{2}$O$_{3}$+3H$_{2}$O}
- MnO_2+4HCl→MnCl_2+Cl_2↑+2H_2O
- H_2+Cl_2 \xrightarrow[]{t^o} 2HCl
- Fe+2HCl→FeCl_2+H_2
- 2FeCl_2+Cl_2 \xrightarrow[]{t^o} 2FeCl_3
- FeCl_3+3NaOH→Fe(OH)_3↓+3NaCl
- 2Fe(OH)_3 \xrightarrow[]{t^o} Fe_2O_3+3H_2O
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