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\(3Fe + 2O_2 \xrightarrow{t^o} Fe_3O_4\\ Fe_3O_4 + 8HCl \to 2FeCl_3 + FeCl_2 + 4H_2O\\ FeCl_2 + 2KOH \to Fe(OH)_2 + 2KCl\\ 2Fe(OH)_2 + \dfrac{1}{2}O_2 + H_2O \to 2Fe(OH)_3\\ 2Fe(OH)_3 \xrightarrow{t^o} Fe_2O_3 + 3H_2O\)
a) \(2NaCl+2H_2O-dpcmn-->2NaOH+Cl_2+H_2\)
\(Cl_2+H_2-t^0->2HCl\)
\(Fe_2O_3+3H_2-t^0->2Fe+3H_2O\)
\(Fe+2HCl-->FeCl_2+H_2\uparrow\)
\(2FeCl_2+Cl_2-->2FeCl_3\)
\(FeCl_3+3NaOH-->Fe\left(OH\right)_3\downarrow+3NaCl\)
b) \(KK-ccpd-->O_2\uparrow\)
\(4FeS_2+11O_2-t^0->2Fe_2O_3+8SO_2\uparrow\)
\(2NaCl+2H_2O-dpcmn-->2NaOH+Cl_2\uparrow+H_2\uparrow\)
\(2SO_2+O_2-t^0,V2O5-->2SO_3\)
\(SO_3+H_2O-->H_2SO_4\)
\(Fe_2O_3+3H_2SO_4-->Fe_2\left(SO_4\right)_3+3H_2O\)
\(6NaOH+Fe_2\left(SO_4\right)_3-->2Fe\left(OH\right)_3+3Na_2SO_4\)
\(\left(1\right)Fe+\frac{1}{2}O_2\underrightarrow{t^o}FeO\\ \left(2\right)FeO+2HCl\rightarrow FeCl_2+H_2O\\ \left(3\right)FeCl_2+2NaOH\rightarrow Fe\left(OH\right)_2+2NaCl\\ \left(4\right)4Fe\left(OH\right)_2+O_2\underrightarrow{t^o}2Fe_2O_3+4H_2O\\ \left(5\right)Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\\ \left(6\right)FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\)
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
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Đáp án B
Các phản ứng oxi hóa khử gồm : (1), (3), (5), (6)
\(a.\)
\(NaCl+H_2SO_4\underrightarrow{t^0}NaHSO_4+HCl\)
\(2KMnO_4+16HCl\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\)
\(Fe+\dfrac{3}{2}Cl_2\underrightarrow{t^0}FeCl_3\)
\(2FeCl_3+Fe\rightarrow3FeCl_2\)
\(FeCl_2\underrightarrow{đpdd}Fe+Cl_2\)
\(Fe+2AgNO_3\rightarrow Fe\left(NO_3\right)_2+2Ag\)
\(b.\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
\(FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_2+3NaCl\)
\(2Fe\left(OH\right)_2+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+6H_2O\)
\(Fe_2\left(SO_4\right)_3+3BaCl_2\rightarrow2FeCl_3+3BaSO_4\)
1.Fe+H2SO4.➜ FeSO4+H2
2.FeSO4+ NaOH➜ Fe(OH)2 + Na2SO4
3.Fe2(SO4)3+ 6NaOH➜ 2Fe(OH)3 +3Na2SO4
4.Fe(OH)2➜ FeO +H2O
5.2Fe(OH)3➜ Fe2O3 +3H2O
6.FeO+ 2HCl ➜ FeCl2 +H2O
7.Fe2O3+ 6HCl ➜2FeCl3 +3H2O
8.Fe+Cl2➜FeCl2
9.2Fe+6HCl ➜2FeCl3 +3H2
10.2FeCl3.➜2FeCl2 +Cl2
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Nhớ tích cho mình nhé
\(Fe_2O_3+3H_2\underrightarrow{t^0}2Fe+3H_2O\)
\(Fe+\dfrac{3}{2}Cl_2\underrightarrow{t^0}FeCl_3\)
\(2FeCl_3+Fe\rightarrow3FeCl_2\)
\(FeCl_2\underrightarrow{dpdd}Fe+Cl_2\)
\(Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2Fe + 3H_2O\\ 2Fe + 3Cl_2 \xrightarrow{t^o} 2FeCl_3\\ 2FeCl_3 + Fe \to 3FeCl_2\\ Mg + FeCl_2 \to Fe + MgCl_2\)