\(3Fe + 2O_2 \xrightarrow{t^o} Fe_3O_4\\ Fe_3O_4 + 8HCl \to 2FeCl_3 + FeCl_2 + 4H_2O\\ FeCl_2 + 2KOH \to Fe(OH)_2 + 2KCl\\ 2Fe(OH)_2 + \dfrac{1}{2}O_2 + H_2O \to 2Fe(OH)_3\\ 2Fe(OH)_3 \xrightarrow{t^o} Fe_2O_3 + 3H_2O\)

\(Fe+O_2-->Fe_3O_4\\ Fe_3O_4+HCl-->FeCl_2+FeCl_3+H_2O\\ FeCl_2+NaOH-->Fe\left(OH\right)_2+NaCl\\ Fe\left(OH\right)_2+O_2+H_2O-->Fe\left(OH\right)_3\\ Fe\left(OH\right)_3-t^o->Fe_2O_3+H_2O\)

(1) 4 Na + O2 -to-> 2 Na2O

(2) Na2O + H2O -> 2 NaOH

(3) 3 NaOH + FeCl3 -> 3 NaCl + Fe(OH)3

(4) 2 Fe(OH)3 -to-> Fe2O3 + 3 H2O

(5) Fe2O3 + 3 CO -to-> 2 Fe + 3 CO2

(6) 2 Fe + 3 Cl2 -to-> 2 FeCl3

4Na + O2 -to-> 2Na2O 

Na2O + H2O => 2NaOH 

3NaOH + FeCl3 => 3NaCl + Fe(OH)3 

2Fe(OH)3 -to-> Fe2O3 + 3H2O 

Fe2O3 + 3H2 -to-> 2Fe + 3H2O 

Fe + 3/2Cl2 -to-> FeCl3 

\(\left(1\right)Fe+\frac{1}{2}O_2\underrightarrow{t^o}FeO\\ \left(2\right)FeO+2HCl\rightarrow FeCl_2+H_2O\\ \left(3\right)FeCl_2+2NaOH\rightarrow Fe\left(OH\right)_2+2NaCl\\ \left(4\right)4Fe\left(OH\right)_2+O_2\underrightarrow{t^o}2Fe_2O_3+4H_2O\\ \left(5\right)Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\\ \left(6\right)FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\)

2Fe + O2---->2FeO

FeO +2HCl------>FeCl2+H2O

FeCl2 + 2NaOH-----> Fe(OH)2 +2NaCl

4Fe(OH)2 +O2----->2Fe2O3+4H2O

Fe2O3+6HCl----->2FeCl3 +3H2O

FeCl3+3NaOH---->Fe(OH)3 +3NaCl

Chúc bạn học tốt

2Fe+O2--->2FeO

FeO+2HCl--->FECl2+H2O

FeCl2+2NaOH--->Fe(OH)2+2NaCl

4Fe(OH)+O2--->2Fe2O3+4H2O

Fe2O3+6HCl--->2FeCl3+3H2O

FeCL3+3NaOH--->Fe(OH)3+3NaCl

\(a.\)

\(NaCl+H_2SO_4\underrightarrow{t^0}NaHSO_4+HCl\)

\(2KMnO_4+16HCl\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\)

\(Fe+\dfrac{3}{2}Cl_2\underrightarrow{t^0}FeCl_3\)

\(2FeCl_3+Fe\rightarrow3FeCl_2\)

\(FeCl_2\underrightarrow{đpdd}Fe+Cl_2\)

\(Fe+2AgNO_3\rightarrow Fe\left(NO_3\right)_2+2Ag\)

\(b.\)

\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)

\(FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_2+3NaCl\)

\(2Fe\left(OH\right)_2+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+6H_2O\)

\(Fe_2\left(SO_4\right)_3+3BaCl_2\rightarrow2FeCl_3+3BaSO_4\)

Đáp án : B

Đáp án B

Các phản ứng oxi hóa khử gồm : (1), (3), (5), (6)

\(a) 2Fe(OH)_3 \xrightarrow{t^o} Fe_2O_3 + 3H_2O\\ Fe_2O_3 + 3CO \xrightarrow{t^o} 2Fe + 3CO_2\\ 2Fe + 3Cl_2 \xrightarrow{t^o} 2FeCl_3\\ 2FeCl_3 + Fe \rightarrow 3FeCl_2\)

\(b) 6nCO_2 + 5nH_2O \xrightarrow[\text{chất diệp lục}]{\text{ánh sáng}} (-C_6H_{10}O_5-)_n + 6nO_2\\ (-C_6H_{10}O_5-)_n + nH_2O \xrightarrow{axit} nC_6H_{12}O_6\\ C_6H_{12}O_6 \xrightarrow{\text{men rượu}} 2CO_2 + 2C_2H_5OH\\ C_2H_5OH + O_2 \xrightarrow{\text{men giấm}} CH_3COOH + H_2O\)

\(2Fe+3Cl_2\rightarrow\left(t^o\right)2FeCl_3\\ FeCl_3+3KOH\rightarrow Fe\left(OH\right)_3+3KCl\\ 2Fe\left(OH\right)_3\rightarrow\left(t^o\right)Fe_2O_3+3H_2O\\ Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)

2Fe+3Cl₂→(t^o)2FeCl₃

FeCl₃+3KOH→Fe(OH)3+3KCl₂

Fe(OH)₃→(t^o)Fe₂O₃+3H₂O

Fe₂O₃+6HCl→2FeCl₃+3H₂O

`a)`

`FeCl_3 + 3KOH -> Fe(OH)_3 + 3KCl`

`2Fe(OH)_3 -> (t^o) Fe_2O_3 + 3H_2O`

`Fe_2O_3 + 3CO -> (t^o) 2Fe + 3CO_2`

`3Fe + 2O_2 -> (t^o) Fe_3O_4`

`b)`

`2Al + 6HCl -> 2AlCl_3 + 3H_2O`

`AlCl_3 + 3KOH -> Al(OH)_3 + 3KCl`

`2Al(OH)_3 -> (t^o) Al_2O_3 + 3H_2O`

`2Al_2O_3 -> (đpnc, Criolit) 4Al + 3O_2`