What is the oxidation number of nitrogen in NO3?

The oxidation number of nitrogen in NO₃^– (nitrate ion) is +5.

Here’s the explanation:

1. The nitrate ion (NO₃^–) has a total charge of -1.

2. Oxygen typically has an oxidation number of -2.

3. Let the oxidation number of nitrogen be x.

4. The sum of the oxidation numbers in the ion must equal the charge of the ion.

5. Therefore, x + 3(-2) = -1.

6. Solving for x: x – 6 = -1 → x = +5.

So, the oxidation number of nitrogen in NO₃^– is +5.