one relevant observation when hot concentrated HNO3 is poured over saw dust
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Nitric acid being a strong oxidising agent decomposes to give nascent oxygen, which being very reactive, oxidises organic compounds to carbon dioxide and water. Saw dust is organic in nature. When hot cone. HNO3 is poured over saw dust, it burst into flames due to oxidation.
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Alcohol or saw dust catshes fire when drop of concentrated nitric acid is added to it. It is due to alcohol or saw dust contains carbon which is oxidesed to carbon dioxide by concentrated nitric acid.
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