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The correct order of the oxidation states of nitrogen in NO, N2O, NO2 and N2O3 is:

1. NO2 < NO < N2O3 < N2O
2. NO2 < N2O3 < NO < N2O
3. N2O < N2O3 < NO < NO2
4. N2O < NO < N2O3 < NO2

Correct answer: N2O < NO < N2O3 < NO2

Solution

Oxidation number of N: N2O = +1, NO = +2, N2O3 = +3, NO2 = +4. Increasing order is therefore N2O < NO < N2O3 < NO2.

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