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Reactions with acids

When acid rea...

Question

When acid reacts with metals, it releases hydrogen gas but there is one acid which, when
reacts with metals, does not release hydrogen except for two metals. Explain.

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Solution

Dear student ,

Nitric acid is a string oxidizing agent. So as soon as hydrogen gas is formed in the reaction between a metal and nitric acid, the nitric acid oxidizes hydrogen gas to water and itself get reduced to any of nitrogen oxides. Thus nitric acid does not release hydrogen gas upon reaction with metals.
The reaction between Mg and HNO₃ is given by-

4Mg+10HNO₃→4Mg (NO₃)₂+NH₄NO₃+3H₂O

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