` CA CO _3toCa O+CO_ 2 ` `2 Fe S_2+(1)/(2) O_2toFe_2O_3 +4 SO_2` `Al _2 O_3xH_ 2 OtoAl _ 2 O_3+xH_ 2O`` ZNS +(3)/(2)O_2 toZnO+SO_2`
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