B |
(1)③ (2)① (3)④ (4)② |
(1)Al2O3+2OH-==2AlO2-+H2O (2)2Al+2OH-+2H2O==2AlO2-+3H2↑ |
AB |
D |
(1); |
(2)Al2O3+2OH-=2AlO2-+H2O (3)CO(g)+l/2O2(g)=CO2(g) △H= -283 kJ/mol (4)3Fe2++4H++NO3-=3Fe3++NO↑+2H2O;酸;Fe3++3H2OFe(OH)3+3H+ |
D |
(1)Na>Al>O (2)HNO3 >H2CO3 >H2SiO3 (3)(或) (4)ab (5)Al3+ +3NH3·H2O===Al(OH)3 +3NH4+;;溶液的pH等于7 |
(1)Al2O3+2OH-+3H2O=2[Al(OH)4]-;SiO2+2OH-=SiO32-+H2O (2)[Al(OH)4]-+CO2=HCO3-+ Al(OH)3 (3)KSCN (4)NaHCO3 |
B |