C11:C

C12:D

C13:C

C14:C

C15:C

Đề không có HCl, H₂SO₄

\(a,Na_2O+H_2O\rightarrow2NaOH\\ b,SO_3+H_2O\rightarrow H_2SO_4\\ c,K_2SO_3+H_2SO_4\rightarrow K_2SO_4+SO_2+H_2O\\ d,CaCO_3+H_2SO_4\rightarrow CaSO_4+CO_2+H_2O\\ e,Cu+2H_2SO_4\left(đ\right)\rightarrow CuSO_4+SO_2+2H_2O\\ f,NaCl+H_2O\underrightarrow{^{dpdd.cmnx}}NaOH+\dfrac{1}{2}Cl_2+\dfrac{1}{2}H_2\\ g,Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3+H_2O\\ h,CaO+2HCl\rightarrow CaCl_2+H_2O\\ i,2KOH+CuSO_4\rightarrow Cu\left(OH\right)_2+K_2SO_4\\ j,FeSO_4+BaCl_2\rightarrow BaSO_4+FeCl_2\\ k,AgNO_3+NaCl\rightarrow AgCl+NaNO_3\)

\(2Al\left(OH\right)_3\underrightarrow{^{to}}Al_2O_3+3H_2O\)

3A

4A

5B

6A

\(2CH_4\underrightarrow{^{làm.lạnh.nhanh,1500^oC}}C_2H_2+3H_2\\ C_2H_2+HCl\rightarrow C_2H_3Cl\)

Pt cuối: 

Thể tích khí thiên nhiên cần (thực tế):

\(V_{CH_4\left(TT,đktc\right)}=\dfrac{32.250}{62,5}:50\%:80\%=320\left(kg\right)\)

Mình chọn đáp án nhé. Không hiểu bạn cứ hỏi lại nha! Chọn A

\(KL:A\left(II\right)\\ n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\\ A+2H_2O\rightarrow A\left(OH\right)_2+H_2\\ n_A=n_{AOH}=n_{H_2}=0,25\left(mol\right)\\ \Rightarrow M_A=\dfrac{10}{0,25}=40\left(\dfrac{g}{mol}\right)\\ \Rightarrow A\left(II\right):Canxi\left(Ca=40\right)\\ m_{Ca\left(OH\right)_2}=74.0,25=18,5\left(g\right)\\ m_{ddCa\left(OH\right)_2}=10+200-0,25.2=209,5\left(g\right)\\ C\%_{ddCa\left(OH\right)_2}=\dfrac{18,5}{209,5}.100\approx8,831\%\)