Answered

In which substance does chlorine have an oxidation number of +1?
(1) Cl2 (3) HClO(2) HCl (4) HClO2

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Lulu1991id
The answer is (3) HClO. In the Cl2, chlorine has an oxidation number of zero. In HCl, the oxidation number is -1. In HClO2, the oxidation number is +3. In HClO, it is +1. You can calculate this by using O with oxidation number of -2 and H with +1.