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b)4Al+3O2--->2Al2O3
c)Sn+O2--->SnO2
d)2Mg+O2--->2MgO
b) 4 Al + 3O₂ ----> 2Al₂O₃
c) Sn(IV) + O₂ ---> SnO₂
d) 2Mg + O₂ ---> 2MgO