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Mình làm câu 2 nhé:

Cho thử quỳ tím:

- Quỳ tím chuyển đỏ -> H2SO4, HCl (1)

- Quỳ tím chuyển xanh -> NaOH

- Quỳ tím không đổi màu -> NaCl, NaI, NaBr (2)

Cho lần lượt các chất (1) tác dụng với BaCl2:

- Xuất hiện kết tủa trắng -> H2SO4

BaCl2 + H2SO4 -> BaSO4 + 2HCl

- Không hiện tượng -> HCl

Cho lần lượt các chất (2) tác dụng với AgNO3:

- Kết tủa màu trắng -> AgCl

NaCl + AgNO3 -> AgCl + NaNO3

- Kết tủa màu vàng nhạt -> NaBr

NaBr + AgNO3 -> NaNO3 + AgBr

Kết tủa màu vàng đậm -> NaI

NaI + AgNO3 -> AgI + NaNO3

bài 1

câu a:

Mn02 + 4HCl --> MnCl2 + Cl2 + 2H20

Cl2 + H2 -->t° ánh sáng 2HCl

4HCl + Mn02 --> MnCl2 + Cl2 + 2H20

Cl2 + 2Na -->t° 2NaCl

2NaCl -->điện phân nóng chảy 2Na + Cl2

câu b/

 2KMnO4 + 16HCl (đ) -> 2KCl + 2MnCl2 + 5Cl2 + 8H2O (Đ.C Cl2)
Cl2 + KOH -> KCl + KClO3 + H2O
2KClO3 -> 2KCl + 3O2 (đ/c khí O2 lớp 8)
2KCl -> 2K + Cl2
Cl2 + H2O ->HCl + HClO
2HCl + Fe -> FeCl2 + H2
2FeCl2 + Cl2 -> 2FeCl3
FeCl3 + NaOH -> Fe(OH)3 + NaCl

câu c/

HCl ---> Cl2 ---> FeCl3 ---> NaCl ---> HCl ---> CuCl2 ---> AgCl
2HCl→Cl2+H2
3Cl2+2Fe→2FeCl3
3NaOH+FeCl3→3NaCl+Fe(OH)3
H2SO4+NaCl→HCl+NaHSO4
CuO+2HCl→2H2O+CuCl2
2AgNO3+CuCl2→2AgCl+Cu(NO3)2

Bài 2:

CTHH: MO

\(n_{MO}=\dfrac{15,3}{M_M+16}\left(mol\right)\)

PTHH: MO + 2HCl --> MCl₂ + H₂O

=> \(n_{MCl_2}=\dfrac{15,3}{M_M+16}\left(mol\right)\)

=> \(\dfrac{15,3}{M_M+16}\left(M_M+71\right)=20,8\)

=> M_M = 137 (g/mol)

=> M là Ba (Bari)

\(n_{BaO}=\dfrac{15,3}{153}=0,1\left(mol\right)\)

PTHH: BaO + 2HCl --> BaCl₂ + H₂O

            0,1-->0,2

=> m_HCl = 0,2.36,5 = 7,3 (g)

=> \(m_{ddHCl}=\dfrac{7,3.100}{18,25}=40\left(g\right)\)

Bài 3: 

a) 

MnO₂ + 4HCl --t^o--> MnCl₂ + Cl₂ + 2H₂O

2NaOH + Cl₂ --> NaCl + NaClO + H₂O

b)

n_NaOH = 0,5.4 = 2 (mol)

\(n_{MnO_2}=\dfrac{69,6}{87}=0,8\left(mol\right)\)

PTHH: MnO₂ + 4HCl --t^o--> MnCl₂ + Cl₂ + 2H₂O

             0,8--------------------------->0,8

            2NaOH + Cl₂ --> NaCl + NaClO + H₂O

                1,6<--0,8----->0,8----->0,8

=> \(\left\{{}\begin{matrix}n_{NaOH\left(dư\right)}=2-1,6=0,4\left(mol\right)\\n_{NaCl}=0,8\left(mol\right)\\n_{NaClO}=0,8\left(mol\right)\end{matrix}\right.\)

=> \(\left\{{}\begin{matrix}C_{M\left(NaOHdư\right)}=\dfrac{0,4}{0,5}=0,8M\\C_{M\left(NaCl\right)}=\dfrac{0,8}{0,5}=1,6M\\C_{M\left(NaClO\right)}=\dfrac{0,8}{0,5}=1,6M\end{matrix}\right.\)

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

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

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

\(2NaCl+H_2SO_4\underrightarrow{t^o}Na_2SO_4+2HCl\)

\(CuO+2HCl\rightarrow CuCl_2+H_2O\)

\(CuCl_2+2AgNO_3\rightarrow Cu\left(NO_3\right)_2+2AgCl\downarrow\)

b)

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

\(H_2+Cl_2\underrightarrow{t^o}2HCl\)

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

\(FeCl_3+3AgNO_3\rightarrow Fe\left(NO_3\right)_3+3AgCl\downarrow\)

\(2AgCl\underrightarrow{as}2Ag+Cl_2\)

\(2NaBr+Cl_2\rightarrow2NaCl+Br_2\)

\(2NaI+Br_2\rightarrow2NaBr+I_2\)

\(Zn+I_2\underrightarrow{H_2O}ZnI_2\)

\(ZnI_2+2NaOH\rightarrow2NaI+Zn\left(OH\right)_2\)

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

\(3Cl_2+6KOH\underrightarrow{t^o}5KCl+KClO_3+3H_2O\)

\(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)

\(2KCl+H_2SO_4\underrightarrow{t^o}K_2SO_4+2HCl\)

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

\(Ca\left(OH\right)_2+Cl_2\rightarrow CaOCl_2+H_2O\)

a. NaCl → Cl₂ → FeCl₃ → NaCl → HCl → CuCl₂ → AgCl.

2NaCl+2H2O-đp\mn->2NaOH+H2+Cl2

3Cl2+2Fe-to>2FeCl3

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

2NaCl+H2SO4-to>Na2SO4+2HCl

2HCl+CuO->CuCl2+H2O

CuCl2+2AgNO3->2AgCl+Cu(NO3)2

b. CaCO₃ → CaCl₂ → NaCl → NaOH → NaClO → NaCl → Cl₂ → FeCl₃ → AgCl

CaCO3+2HCl->CaCl2+H2O+CO2

CaCl2+Na2CO3->2NaCl+CaCO3

2NaCl+2H2o-đp->2NaOH+Cl2+H2

2NaOH+Cl2-to>NaCl+NaClO+H2O

2NaClO-to->2NaCl+O2

2NaCl+2H2O-đp\mn->2NaOH+H2+Cl2

3Cl2+2Fe-to>2FeCl3

FeCl3+3AgNO3->3AgCl+Fe(NO3)3

Nguyên tố A là Carbon, là nguyên tố phi kim

a)

\(4HCl+MnO_2\rightarrow MnCl_2+Cl_2+2H_2O\\ 3Cl_2+2Fe\xrightarrow[]{t^o}2FeCl_3\\ FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\\ 2NaCl+H_2SO_{4\left(\text{đ}\right)}\xrightarrow[]{t^o}Na_2SO_4+2HCl\)

b)

\(2KMnO_4+16HCl\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\\ Cl_2+H_2\xrightarrow[]{a/s}2HCl\\ 6HCl+Fe_2O_3\rightarrow2FeCl_3+3H_2O\\ FeCl_3+3AgNO_3\rightarrow Fe\left(NO_3\right)_3+3AgCl\)

c)

\(MnO_2+4HCl\rightarrow MnCl_2+Cl_2+2H_2O\\ Cl_2+H_2\xrightarrow[]{a/s}2HCl\\ 2HCl+Fe\rightarrow FeCl_2+H_2\\ FeCl_2+2AgNO_3\rightarrow Fe\left(NO_3\right)_2+2AgCl\)

d)

\(3Cl_2+6KOH_{\left(\text{đ}\text{ặ}c\right)}\xrightarrow[]{t^o}5KCl+KClO_3+3H_2O\\ 2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\\ 2KCl\xrightarrow[]{\text{đ}pnc}2K+Cl_2\\ Cl_2+Ca\xrightarrow[]{t^o}CaCl_2\)

e)

\(2KMnO_4+16HCl\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\\ 3Cl_2+6KOH_{\left(\text{đ}\text{ặ}c\right)}\xrightarrow[]{t^o}5KCl+KClO_3+3H_2O\\ 2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\\ 2KCl\xrightarrow[]{\text{đ}pnc}2K+Cl_2\)

g)

\(2KI+O_3+H_2O\rightarrow2KOH+I_2+O_2\\ I_2+H_2\xrightarrow[]{t^o,p,xt}2HI\\ 2HI+Cl_2\rightarrow2HCl+I_2\\ KOH+HCl\rightarrow KCl+H_2O\)

a, Cl2 + 2Na -> (t°) 2NaCl

2NaCl + H2SO4 -> Na2SO4 + 2HCl

4HCl + MnO2 -> MnCl2 + 2H2O + Cl2

Ca + Cl2 -> (t°) CaCl2

b, 4HCl + MnO2 -> MnCl2 + 2H2O + Cl2

2Fe + 3Cl2 -> (t°) 2FeCl3

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

2NaCl + H2SO4 -> Na2SO4 + 2HCl

c, MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2

3Cl2 + 6KOH (đặc nóng) -> 5KCl + KClO3 + 3H2O 

2KCl + H2SO4 -> K2SO4 + 2HCl

4HCl + MnO2 -> MnCl2 + 2H2O + Cl2

2Cl2 + 2Ca(OH)2 -> CaCl2 + Ca(OCl)2 + 2H2O

d, 16HCl + 2KMnO4 -> 5Cl2 + 8H2O + 2KCl + 2MnCl2

3Cl2 + 6KOH (đặc nóng) -> 5KCl + KClO3 + 3H2O

2KCl -> (đpnc) 2K + Cl2

Cl2 + 2NaBr -> 2NaCl + Br2

Br2 + 2NaI -> 2NaBr + I2

a) 

\(MnO_2+4HCl\underrightarrow{t^o}MnCl_2+Cl_2+2H_2O\)

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

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

\(2NaCl\left(r\right)+H_2SO_4đ\rightarrow Na_2SO_4+2HCl\)

\(CuO+2HCl\rightarrow CuCl_2+H_2O\)

\(CuCl_2+2AgNO_3\rightarrow2AgCl+Cu\left(NO_3\right)_2\)

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

\(Cl_2+H_2\underrightarrow{as}2HCl\)

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

\(FeCl_3+3AgNO_3\rightarrow3AgCl+Fe\left(NO_3\right)_3\)

\(2AgCl\underrightarrow{as}2Ag+Cl_2\)

\(Cl_2+2NaBr\rightarrow2NaCl+Br_2\)

\(Br_2+2NaI\rightarrow2NaBr+I_2\)

\(Zn+I_2\underrightarrow{t^o}ZnI_2\)

\(ZnI_2+2NaOH\rightarrow2NaI+Zn\left(OH\right)_2\)

c. \(MnO_2+4HCl\underrightarrow{t^o}MnCl_2+Cl_2+2H_2O\)

\(3Cl_2+6KOH\rightarrow3H_2O+5HCl+KClO_3\)

\(2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\)

\(2KCl\left(r\right)+H_2SO_4đ\underrightarrow{t^o}K_2SO_4+2HCl\)

\(MnO_2+4HCl\underrightarrow{t^o}MnCl_2+Cl_2+H_2O\)

\(Cl_2+Ca\left(OH\right)_2\rightarrow CaOCl_2+H_2O\)

e. \(2KMnO_4+16HClđ\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\)

\(2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\)

\(2KCl+2H_2O\underrightarrow{dpdd}2KOH+H_2+Cl_2\)

\(H_2+Cl_2\underrightarrow{t^o}2HCl\)

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

\(2FeCl_2+Cl_2\underrightarrow{t^o}2FeCl_3\)

\(FeCl_3+3NaOH\rightarrow3NaCl+Fe\left(OH\right)_3\)

4HCl+MnO2-->MnCl2+2H2O+Cl2

3Cl2+2Fe-->2FeCl3

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

2NaCl+H2SO4-->Na2SO4+2HCl

2HCl+Cuo-->CuCl2+H2O

CuCl2+2AgNO3-->2AgCl+Cu(NO3)2

3)

câu c