why hydrogen is not evolved when notric acid reacts with metals?
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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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nitric acid is a strong oxidising agent
The hydrogen gas produced during the reaction with metal gets oxidized to h2o,hence no hydrogen gas produced. Instead it evolves nitric oxides such as N2O,NO, ect.
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