Đáp án:

Giải thích các bước giải:

 Các chất tác dụng đc vs al, fe gồm: cu(no3)2, hcl, cl2, agno3, h2so4 đặc nóng

Các pthh: 

2al+3cu(no3)2 -> 2al(no3)3+ 3cu

fe+ 2cu(no3)2-> fe(no3)2 +2cu

2al+6hcl-> 2alcl3+3h2

fe+2hcl->fecl2+h2

2al+3cl2->2acl3

2fe+3cl2->2fecl3

al+ 3agno3->al(no3)3+3ag

fe+2agno3->fe(no3)2+2ag

2al+6h2so4 đặc nóng->al2(so4)3+s3o2+6h2o

2fe+6h2so4 đặc nóng->fe2(so4)3+s3o2+6h2o

Bạn tham khảo!
$\text{1) Al: Cu(NO3)2, HCl, KOH, Cl2, O2, AgNO3, H2SO4(đặc nóng)}$
$\rightarrow$ $\text{2Al+3Cu(NO3)2$\rightarrow$2Al(NO3)3+3Cu}$

$\rightarrow$ $\text{2Al+6HCl$\rightarrow$2AlCl3+3H2}$
$\rightarrow$ $\text{2Al+2KOH+2H2O$\rightarrow$2KAlO2+3H2}$
$\rightarrow$ $\text{2Al+3Cl2$\xrightarrow{t^o}$2AlCl3}$
$\rightarrow$ $\text{4Al+3O2$\xrightarrow{t^o}$2Al2O3}$
$\rightarrow$ $\text{Al+3AgNO3$\rightarrow$Al(NO3)3+3Ag}$
$\rightarrow$ $\text{2Al+6H2SO4(đặc,nóng)$\rightarrow$Al2(SO4)3+3SO2+6H2O}$
$\text{2) Fe: Cu(NO3)2, HCl, Cl2, O2, AgNO3, H2SO4(đặc,nóng)}$
$\rightarrow$ $\text{Fe+Cu(NO3)2$\rightarrow$Fe(NO3)2+Cu}$
$\rightarrow$ $\text{Fe+2HCl$\rightarrow$FeCl2+H2}$
$\rightarrow$ $\text{2Fe+3Cl2$\xrightarrow{t^o}$2FeCl3}$
$\rightarrow$ $\text{3Fe+2O2$\xrightarrow{t^o}$Fe3O4}$
$\rightarrow$ $\text{Fe+2AgNO3$\rightarrow$Fe(NO3)2+2Ag}$
$\rightarrow$ $\text{2Fe+6H2SO4(đặc,nóng)$\rightarrow$Fe2(SO4)3+3SO2+6H2O}$