When metals like Na, K, Ca react with acids like HCL , Hydrogen gas is evolved. Explain why no evolution of hydrogen gas takes place when the same metals react with HNO3.

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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

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Why generally Hydrogen gas is not evolved when metals react with dilute Nitric acid?

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Q. Metals like copper fail to evolve hydrogen gas on reacting with dilute nitric acid.

Metal reacts with acid to produce hydrogen gas. But when metal reacts with $H N O_{3}$ hydrogen gas is not given out. Give a reason.

Dilute acids like hydrochloric acid (HCl), sulphuric acid $H_{2} S O_{4}$ react with certain active metals to evolve hydrogen gas and form their metallic salts.

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