Question

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

Answer 1

hydrogen is not evolved when these metals react with nitric acid because

nitric acid is a strong oxidizing agent and when reacting with metals it gets reduced rather than producing hydrogen

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Answer 2

That is why zinc displaces hydrogen from dilute hydrochloric acid, while copper does not. 38. (a) Metals such as silver when attacked by substances around it such as moisture, acids, gases etc, are said to corrode and this phenomenon is called corrosion.

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