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Prove that nitric acid contains nitrogen gas. Quick answer please!!!!!!

Nitric acid formula is HNO3 and on heating it gives nitrogen dioxide which is reddish brown in colour. This indicates the presence of nitrogen in the form of NO2 gas.

4 HNO3 ------> 4NO2 + O2 + 2 H2O

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the formula of nitric acid is HNO3
​therefore it contains nitrogen
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Formula of Nitric Acid is HNO3. So we can say that H2O will seprate from it and NO2 will be remain . So It contains Nitrogen.
Hope this  will help you.
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