NO (Nitric Oxide / Nitrogen Monoxide) is an important compound in environmental chemistry and biology. Calculating the oxidation state of nitrogen in NO is a standard exam question.
NO is a radical (has an unpaired electron), making it highly reactive. It readily reacts with oxygen in air to form NO₂ (the reddish-brown gas associated with photochemical smog).
In NO (Nitric Oxide):
Oxidation state of Oxygen = -2
Let oxidation state of Nitrogen = x
For neutral molecule: x + (-2) = 0
x = +2
Oxidation state of Nitrogen in NO = +2
| Compound | Oxidation state of N |
|---|---|
| N₂O | +1 |
| NO | +2 |
| N₂O₃ | +3 |
| NO₂ | +4 |
| N₂O₅ | +5 |
| NH₃ | -3 |
In NO₂: x + 2(-2) = 0 → x - 4 = 0 → x = **+4**
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