Question

Answer 1

\(MnO_2+4HCl\rightarrow MnCl_2+Cl_2+2H_2O\)

\(Cl_2+H_2\rightarrow HCl\)

\(2HCl+Fe\rightarrow FeCl_2+H_2\)

\(FeCl_2+2NaOH\rightarrow Fe\left(OH\right)_2+2NaCl\)

\(4Fe\left(OH\right)_2+O_2\rightarrow2Fe_2O_3+4H_2O\)

\(3Cl_2+2Fe\rightarrow2FeCl_3\)

\(FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\)

Answer 2

(1) MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2

(2) H2 + Cl2 -> (ánh sáng) 2HCl

(3) Fe + 2HCl -> FeCl2 + H2

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

(5) Fe(OH)2 + O2 -> (t°) Fe2O3 + H2O

(6) 2Fe + 3Cl2 -> (t°) 2FeCl3

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

(8) Fe(OH)3 + 3HNO3 -> Fe(NO3)3 + 3H2O