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The correct order of the oxidation states of nitrogen in NO, N 2 O, NO 2 and N 2 O 3 is :

1. NO 2 < NO < N 2 O 3 < N 2 O
2. N 2 O < NO < N 2 O 3 < NO 2
3. NO 2 < N 2 O 3 < NO < N 2 O
4. N 2 O < N 2 O 3 < NO < NO 2

Correct answer: N 2 O < NO < N 2 O 3 < NO 2

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