The law of definite proportions is not applicable to nitrogen oxide because:

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Strategy:
 The Law of Definite Proportions applies to fixed chemical compounds. If an element can exist in multiple oxidation states (variable valency), it forms different oxides, each with a different mass ratio, appearing as a violation if not viewed as distinct species.

Step 1: Analyze Nitrogen's behavior
Nitrogen exhibits multiple oxidation states ( to ), allowing it to form oxides like .

Step 2: Relate to the law's limitation
Because the equivalent weight of Nitrogen changes depending on

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