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Question

Hydrogen gas is not evolved when metals react with_______.


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Solution

Evolution of hydrogen gas:

  • Hydrogen gas is not evolved when there is a reaction between metal and Nitric acid (HNO3)occurs as Nitric acid is a strong oxidizing agent.
  • The Hydrogen gas produced during the reaction with metal gets oxidized to H2O, hence no hydrogen gas is produced.
  • Instead, it evolves nitric oxides such as NO2,NO etc.
  • Example: When a Silver metal reacts with Nitric acid (HNO3)to give N2OandH2O.

Ag(s)(Silver)+2HNO3(l)(Nitricacid)AgNO3(s(Silvernitrate))+NO2(g)(Nitrogendioxide)+H2O(l)(Water)

Hence, hydrogen gas is not evolved when metals react with Nitric acid.


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