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When dilute nitric acid (HNO3) reacts with non metals (excluding H2, C, N2 and O2) it forms acid from that non metal. For example, if HNO3 reacts with sulfur (S) it gives nitric oxide, water and sulfuric acid (H2SO4). It only reacts with carbon to form carbon dioxide (CO2) instead of its acid. Some more examples:

HNO3 + P --> H3PO4 + NO + H2O

HNO3 + S --> H2SO4 + NO + H2O

HNO3 + Se --> H2SeO3 + NO + H2O

HNO3 + C --> CO2 + NO + H2O

HNO3 + S --> H2SO4 + NO + H2O

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Q: What is reaction of nonmetals with acids?
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