Question

Why hydrogen gas is not evolved when metals like magnesium, zinc added to nitric acid?

Answer 1

Nitric acid(HNO3) is a strong oxidising agent. The Hydrogen gas produced during its reaction with metal gets oxidised to H2O, hence no hydrogen gas is produced. Instead it evolves nitric oxides such as NO2,NO

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Answer 2

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question☕☕☕

Why hydrogen gas is not evolved when metals like magnesium, zinc added to nitric acid?

solution ☕☕☕

Nitric acid(HNO3) is a strong oxidising agent. The Hydrogen gas produced during its reaction with metal gets oxidised to H2O, hence no hydrogen gas is produced. Instead it evolves nitric oxides such as NO2,NO etc.

Thus the sole purpose of the reaction is not attained.