June 2021 0 2 Report
1)?+?=SO2 4)Al+?+AlCl3 7)CU+?=CuO 2)P+02=? 5)?+?=CO2 8)?+?=K2O
3)?+O2=CaO 6)Mg+?=MgO 9)?+O2=Al2O3
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