H2 gas is not evolved when most metals react with nitric acid
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Hydrogen gas is not evolved when a metal reacts with nitric acid. It is because HNO3 is a strong oxidising agent. It oxidises the H2 produced to water and itself gets reduced to any of the nitrogen oxides (N2O, NO, NO2). But magnesium (Mg) and manganese (Mn) react with very dilute HNO3 to evolve H2 gas
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Explanation:
Most acids when reacted with metals give Hydrogen gas but nitric acid do not give Hydrogen gas because nitric acid is a strong oxidising agent and oxidise the hydrogen gas produced to water.
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