why metals do not react with nitric acid to evolve hydrogen gas
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Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid, though pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid...
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When metals react with nitric acid hydrogen gas is liberated. Nitric acid is a very strong oxidizing agent. So , it oxidizes the hydrogen gas formed during the reaction to form water and an oxide of nitrogen (NO,N2O,NO2 etc.). Magnesium and manganese react with dilute nitric acid to liberate hydrogen gas.
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