When metals are treated with hno3 hydrogen gas is not liberated why?

1.	When metals are treated with hno3 hydrogen gas is not liberated why?
Answer» Normally when metals are teated with acids, a corresponding salt is produced along with the liberation of hydrogen gas.i.e. Metal + Acid* ----> Salt + Hydrogen (g)However, nitric acid (HNO_3) being a strong oxidizing agent oxidizes the hydrogen gas (produced when it reacts with metals) to give water and itself gets reduced to an oxide of nitrogen which combines with the metal.i.e. Metals* + Nitric Acid ----> (Nitrogenous) Salt + WaterHowever, Manganese and Magnesium react with dilute nitric acid to give hydrogen gas.i.e. Mg or Mn + Nitric Acid ---> Salt + Hydrogen (g)____________________________________________________________________________________________Notes:* Except Nitric Acid (here) A substance which loses oxygen and adds it to another substance* Except Mn or Mg It is because HNO3 is a strong oxidising agent. It oxidise the hydrogen to form water. But in some cases like Mg and Mn react with very dilute nitric acid (HNO3 ) to form hydrogen..

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