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1.4 Al+3O2=2Al2O3
2. Al2O3+6HCl=2AlCl3+3H2O
3. 2Al+6HCl=2AlCl3+3H2
4. 2Al+3H2SO4=Al2(SO4)3+3H2
5.Al2O3+3H2SO4=Al2(SO4)3+3H2O
b)
1.2Ca+O2=2CaO
2. CaO+H2SO4=CaSO4+H20
3.Ca+2H2O=Ca(OH)2+H2
4.CaO+H20=Ca(OH)2
5.Ca(OH)2+H2SO4=CaSO4+2H2O
6.Ca(OH)2+2HNO3=Ca(NO3)2+2H2O