`Cl_2+2H_2O +SO_2 rarr4H^+ +SO_4^(2-) +2Cl^-``CU^(2+) +Zn rarr Zn^(2+) +Cu``2H_(2) + O_(2) rarr 2H_2O``HCI + H_2O →H_3O^+ +CL^-`
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