Consider the following compounds: K$_2$O$_2$, H$_2$O$_2$, and H$_2$SO$_4$ The oxidation states of the underlined elements in them are, respectively:
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In peroxides, the oxidation state of oxygen is -1. In sulfuric acid, sulfur has an oxidation state of +6, and hydrogen generally has an oxidation state of +1.