Why does manganese and magnesium react with nitric acid?
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But magnesium (Mg) and manganese (Mn) react with very dilute HNO3 to evolve H2 gas. ... Mg and Mn are highly reactive metals, they are able to displace hydrogen from the nitric acid, however, less reactive metals do not displace hydrogen gas but get oxidized due to strong oxidising nature of nitric acid.
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Explanation:
Metals also react with nitric acid, but hydrogen gas is not evolved, because nitric acid is a strong oxidising agent. So, it oxidises the hydrogen to water and itself gets reduced to any nitrogen oxide. However, magnesium and manganese react with dilute nitric acid to evolve hydrogen gas.
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