In which of the following compounds does nitrogen have an oxidation number of +4?

Name: In which of the following compounds does nitrogen have an oxidation number of +4?
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Question

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In NO₂, nitrogen has an oxidation number of +4. This is calculated by considering the oxidation number of oxygen as -2, and since there are two oxygen atoms, the total oxidation number for oxygen is -4. To balance this, nitrogen must have an oxidation number of +4.

In Which of the Following Compounds Does Nitrogen Have an Oxidation