4) 5) C₂H4 + 0₂ ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ Ca (OH)2 + ↓ Group 4 CO₂ + Group 5 Al2(SO4)3 → H₂O CaSO4 + Al(OH)3

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