What is the oxidation number of nitrogen in the nitrate ion no31−?

+6

+5

+3

+2

Oxidation state on as in the nitrate ion : +5.

The sum of oxidation states on all atoms in an ion should be the same as the charge of the ion.

The oxidation state of nitrogen N tends to vary. However, the oxidation state of oxygen O is -2 in most cases, with the following exceptions:

To find the oxidation state on N, consider the atoms in a nitrate ion:

The oxidation state of each O atom is expected to be -2. There are three O atoms in each nitrate ion. The oxidation state of the three atoms will add up to .

The oxidation state of the N atom needs to be found. Charge on the nitrate ion is -1. Thus

.

Therefore, the oxidation state of the nitrogen N atom in the nitrate ion is +5.

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