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O2 ⇒ SO2⇒SO3⇒H2SO4
N2⇒NH3⇒NH4OH
Cl2⇒HCl⇒MgCl2
Al⇒Al2O3⇒AlCl3⇒Al(OH)3
Cu⇒CuO⇒CuSO4⇒Cu(OH)2⇒CuO
Na⇒NaOH⇒Na3PO4
Fe⇒FeCl2⇒Fe(OH)2⇒FeO