Mg+2HCl=MgCl2+H2↑
Zn+2HCl=ZnCl2+H2↑
2Al+6HCl=2AlCl3+3H2↑
Mg+CuSO4=MgSO4+Cu
Zn+CuSO4=ZnSO4+Cu
2Al+3CuSO4=Al2(SO4)3+3Cu